Develop Bugs

[HELP] My phone constantly switches to CDMA and than has no signal

Hello I bought my phone off of ebay it was already flashed with tasks rom when I got it and the only problem I have which is very annoying is that it constantly switches from LTE/GSM/CDMA to CDMA only when I goto settings>more>mobile networks...Whenever there is no signal it is set to CDMA only I'm not sure what the problem is but its very frustrurating when I cant make calls when I need to...Is this a known problem? Will I have to revert back to stock?

n023b said:
Hello I bought my phone off of ebay it was already flashed with tasks rom when I got it and the only problem I have which is very annoying is that it constantly switches from LTE/GSM/CDMA to CDMA only when I goto settings>more>mobile networks...Whenever there is no signal it is set to CDMA only I'm not sure what the problem is but its very frustrurating when I cant make calls when I need to...Is this a known problem? Will I have to revert back to stock?
Click to expand...
Click to collapse
who is your carrier and what APNs are installed? also, you're in a GSM forum

xBeerdroiDx said:
who is your carrier and what APNs are installed? also, you're in a GSM forum
Click to expand...
Click to collapse
My carrier is Fido (GSM) its the same as at&t in the US or Rogers in Canada
By APNs do you mean Access Point Names? If so there are three options
Fido Default
fido-core appl1.apn which is the one I use since I use LTE
Fido Internet
internet.fido.ca
Fido tethering
isp.fido.apn

n023b said:
My carrier is Fido (GSM) its the same as at&t in the US or Rogers in Canada
By APNs do you mean Access Point Names? If so there are three options
Fido Default
fido-core appl1.apn which is the one I use since I use LTE
Fido Internet
internet.fido.ca
Fido tethering
isp.fido.apn
Click to expand...
Click to collapse
Fido's website says to use LTEMOBILE.APN if you have an LTE device
http://www.fido.ca/web/content/phonewarranty/configure_unlocked_device_guide&lang=en

xBeerdroiDx said:
Fido's website says to use LTEMOBILE.APN if you have an LTE device
http://www.fido.ca/web/content/phonewarranty/configure_unlocked_device_guide&lang=en
Click to expand...
Click to collapse
Just checked although its named after the core one it has the LTE settings I've been using LTE fine

Even though the settings were the same I still made a new profile for LTE and its having the same problems Sometimes toggling airplane mode or restarting the phone seems to fix it
Again the problem is that the phone constantly loses signal and the mobile network setting says "CDMA only" if I change it back to LTE/GSM/CDMA sometimes the signal will come back

n023b said:
Even though the settings were the same I still made a new profile for LTE and its having the same problems Sometimes toggling airplane mode or restarting the phone seems to fix it
Again the problem is that the phone constantly loses signal and the mobile network setting says "CDMA only" if I change it back to LTE/GSM/CDMA sometimes the signal will come back
Click to expand...
Click to collapse
the fact that your gsm device has built in options for cdma and consistently tries switching to cdma (which is probably why you lose service) tells me something needs to change. on your i747m, what is your baseband version? also, what is your android/task650 release?

xBeerdroiDx said:
the fact that your gsm device has built in options for cdma and consistently tries switching to cdma (which is probably why you lose service) tells me something needs to change. on your i747m, what is your baseband version? also, what is your android/task650 release?
Click to expand...
Click to collapse
I can't believe I forgot to mention what kind of phone it was its not the Canadian model... I bought the phone off of ebay it is an at&t SGH-I747 the phone already had the custom rom on it when I got it.
The baseband version is i747UCDLK3
Kernel version:
30.0.68-underwear kernel
[email protected] #1
Sun Mar 10
AOKP version
d2att (4.2.2 jdq39) build 3.10.2013

n023b said:
I can't believe I forgot to mention what kind of phone it was its not the Canadian model... I bought the phone off of ebay it is an at&t SGH-I747 the phone already had the custom rom on it when I got it.
The baseband version is i747UCDLK3
Kernel version:
30.0.68-underwear kernel
[email protected] #1
Sun Mar 10
AOKP version
d2att (4.2.2 jdq39) build 3.10.2013
Click to expand...
Click to collapse
oh wow, so you literally just bought that on ebay. unfortunately, when buying a device thats already rooted and running a custom ROM, you dont know the procedures used when that ROM was installed. there's a wrong and right way to do it so as to have a smooth running phone with little or no complications. I would make a backup in recovery and then try a different modem or reflash the ROM and google apps (gapps) again. is the ROM and gapps files (.zips) still on the phone?

xBeerdroiDx said:
oh wow, so you literally just bought that on ebay. unfortunately, when buying a device thats already rooted and running a custom ROM, you dont know the procedures used when that ROM was installed. there's a wrong and right way to do it so as to have a smooth running phone with little or no complications. I would make a backup in recovery and then try a different modem or reflash the ROM and google apps (gapps) again. is the ROM and gapps files (.zips) still on the phone?
Click to expand...
Click to collapse
I updated the rom the other day and had to reinstall gapps so yes I'll try flashing other radios.
I went to *#*#4636#*#* and set the radio to GSM/LTE and the phone still drops the signal and doesnt change to WDCDMA...
Edit: Update it will switch to WCDMA

n023b said:
I updated the rom the other day and had to reinstall gapps so yes I'll try flashing other radios.
I went to *#*#4636#*#* and set the radio to GSM/LTE and the phone still drops the signal and doesnt change to WDCDMA...
Click to expand...
Click to collapse
when you updated, did you perform a full wipe? that might fix this whole issue

xBeerdroiDx said:
when you updated, did you perform a full wipe? that might fix this whole issue
Click to expand...
Click to collapse
Yes I did the full wipe, cache wipe, and dalvik cache wipe.. It still has the same problem after I reflashed I'm going to try and flash different radios now.
If that doesn't work whats the next step reverting back to stock and seeing if that works?

n023b said:
Yes I did the full wipe, cache wipe, and dalvik cache wipe.. It still has the same problem after I reflashed I'm going to try and flash different radios now.
If that doesn't work whats the next step reverting back to stock and seeing if that works?
Click to expand...
Click to collapse
Did you format /system?

try unrooting and going back to stock then rerooting.
That worked for me

xBeerdroiDx said:
Did you format /system?
Click to expand...
Click to collapse
Yes I believe I did I went to the official thread and did what it said there
f_E_a_R_e_D said:
try unrooting and going back to stock then rerooting.
That worked for me
Click to expand...
Click to collapse
I'll try that but weird thing...I remember reading somewhere too many open apps may cause signal problems and I just killed all open apps when the signal dropped and about 15 secs later signal was back dont know if this was the problem for sure I'll try again if it happens see if maybe I can narrow it down to a particular app or process

3G/H/H+

Ok so I have a Telus model and this started a few days ago when I flashed an AOKP rom...
So, I don't get LTE in my area and have always had 4G (or whatever they say it is).. Ive flashed many TW roms and ALL the roms have displayed 4g...and for not having lte, ive been very impressed with the speeds.
However, since this AOKP rom I installed (which was awesome, just wanted to go back to TW), it displayed H+...
Now, I know what h/h+ is and all that jazz about the carriers.. My issue is, can't flash any TW rom now without getting 3g/h/h+ toggling back and forth nonstop and the speeds are horrible!!! Can barely download in the store and loading a page takes a while.....and yes, I realize that its supposed to help with battery and whatnot but I don't like it and just want 4G back!!! lol
So far, I can only get 4g back when I unroot and do a hard factory reset...
And even then, it still shows h/H+ until I go through all the system updates.... then, I go to install another TW rom and I'm back with the h/h+ again...
I have tried the att fix, installing latest modem and still no luck.
I even asked to do a factory reset on my fathers phone (we are on the same family plan) and his shows 4g even when installing any TW rom...
Does anyone out there know what I did wrong?? also, my imei number is fine..
Thanks in advance to any advice or help

spenny88 said:
Ok so I have a Telus model and this started a few days ago when I flashed an AOKP rom...
So, I don't get LTE in my area and have always had 4G (or whatever they say it is).. Ive flashed many TW roms and ALL the roms have displayed 4g...and for not having lte, ive been very impressed with the speeds.
However, since this AOKP rom I installed (which was awesome, just wanted to go back to TW), it displayed H+...
Now, I know what h/h+ is and all that jazz about the carriers.. My issue is, can't flash any TW rom now without getting 3g/h/h+ toggling back and forth nonstop and the speeds are horrible!!! Can barely download in the store and loading a page takes a while.....and yes, I realize that its supposed to help with battery and whatnot but I don't like it and just want 4G back!!! lol
So far, I can only get 4g back when I unroot and do a hard factory reset...
And even then, it still shows h/H+ until I go through all the system updates.... then, I go to install another TW rom and I'm back with the h/h+ again...
I have tried the att fix, installing latest modem and still no luck.
I even asked to do a factory reset on my fathers phone (we are on the same family plan) and his shows 4g even when installing any TW rom...
Does anyone out there know what I did wrong?? also, my imei number is fine..
Thanks in advance to any advice or help
Click to expand...
Click to collapse
Verified the APN settings, and the Network Mode is LTE / GSM / WCDMA?

Craptain Krunch said:
Verified the APN settings, and the Network Mode is LTE / GSM / WCDMA?
Click to expand...
Click to collapse
Yes apn checks out just and on LTE/GSM/WCDMA.
Its weird becase my father has the exact same settings. And again, showing his 4g.
As I type this, im on 3g and when I send, it will turn to h+. Speed is horrible

spenny88 said:
Yes apn checks out just and on LTE/GSM/WCDMA.
Its weird becase my father has the exact same settings. And again, showing his 4g.
As I type this, im on 3g and when I send, it will turn to h+. Speed is horrible
Click to expand...
Click to collapse
So it constantly switches between 3g, H, and H+ ? Have you downloaded a network signal app to see what kind of signal you are getting and strong it really is ?
When you say you have done a complete unroot and factory reset, what method are you using ? Is this where to flash an unrooted stock firmware from lets say Sam Mobile and then done a factory reset ? Or are you just doing another type of unroot ? When you root what method are you using ?
You stated you are on a Telus model but flashed an at&t modem ? Are you on AT&T service ?

hednik said:
So it constantly switches between 3g, H, and H+ ? Have you downloaded a network signal app to see what kind of signal you are getting and strong it really is ?
When you say you have done a complete unroot and factory reset, what method are you using ? Is this where to flash an unrooted stock firmware from lets say Sam Mobile and then done a factory reset ? Or are you just doing another type of unroot ? When you root what method are you using ?
You stated you are on a Telus model but flashed an at&t modem ? Are you on AT&T service ?
Click to expand...
Click to collapse
Getting 5753kbps download and 905kbps upload .
Whereas before my kbps were always around 11-12000kbps for the download speeds.
I always flash back to stock rom using odin and then factory reset.
Oh sorry if I stated that wrong. I tried an att fix as well as flashing the most recent modem for my telus device but both fixes did nothing.
Again tho, ive done this so many times with TW roms and cant figure it out..
Im currently trying to go back to stock and use the most recent CWM to flash and see if that helps

spenny88 said:
Getting 5753kbps download and 905kbps upload .
Whereas before my kbps were always around 11-12000kbps for the download speeds.
I always flash back to stock rom using odin and then factory reset.
Oh sorry if I stated that wrong. I tried an att fix as well as flashing the most recent modem for my telus device but both fixes did nothing.
Again tho, ive done this so many times with TW roms and cant figure it out..
Im currently trying to go back to stock and use the most recent CWM to flash and see if that helps
Click to expand...
Click to collapse
It doesn't seem to make sense that even after going back to stock unrooted 4.0.4 (or what ever it cmae with from the factory) you still have signal problems as the odin packages would flash the correct modem once you install.

Sounds like network issues.

Speeds of ~9000kb are actually pretty standard for actual usage with H+/H/3G. Don't worry about speed too much. And for future reference 4G is H+, its just another name for it. The common misconception is that 4G is LTE which it is not.

aeppacher said:
Speeds of ~9000kb are actually pretty standard for actual usage with H+/H/3G. Don't worry about speed too much. And for future reference 4G is H+, its just another name for it. The common misconception is that 4G is LTE which it is not.
Click to expand...
Click to collapse
Thank you for your reply.. yes I know what it means and its pretty cool. But again, my father and I are on the same plan, with telus with same phones. Going back to stock rom with odin still shows h/h+ when it should show 4g. I kniw they are the same, but the fast dormacy is a pain in the rear. My father and I are currently running the same rom with the same service getting 4g on his and h/h+ on mine

hednik said:
It doesn't seem to make sense that even after going back to stock unrooted 4.0.4 (or what ever it cmae with from the factory) you still have signal problems as the odin packages would flash the correct modem once you install.
Click to expand...
Click to collapse
No kidding!! Ive done this a thousand times and have never seen it before..so starting to grt frustrated when told that its normal lol..
So when I get to 4.0.4 its still h/h+, but when I update the first time from samsung, it then shows 4g and my speeds are back to normal. But then as soon as I flash afyer rooting, it gies right back to h/h+ fast dormacy with no way of going back unless i do a hard factory reset again.

spenny88 said:
Thank you for your reply.. yes I know what it means and its pretty cool. But again, my father and I are on the same plan, with telus with same phones. Going back to stock rom with odin still shows h/h+ when it should show 4g. I kniw they are the same, but the fast dormacy is a pain in the rear. My father and I are currently running the same rom with the same service getting 4g on his and h/h+ on mine
Click to expand...
Click to collapse
Are you sure it is the exact same version that you are running? He didn't update at all, no matter how small the update? If you flash from odin, everything that you did in the past should be overwritten. Go to settings->about phone and tell me what both of your baseband/build versions are

aeppacher said:
Are you sure it is the exact same version that you are running? He didn't update at all, no matter how small the update? If you flash from odin, everything that you did in the past should be overwritten. Go to settings->about phone and tell me what both of your baseband/build versions are
Click to expand...
Click to collapse
Ok so the baseband is I747MVLDLK4 and build version is 2.4? lol
I will unroot and flash back to 4.0.4 with a factory reset and then update this post.
Really appreciate ur help
Btw.. I downloaded the whole odin/telus stock tar md5 and recovery about a year ago and have been using that for both of our phones. I will update in a coupke of hours
Also, when I flash back to stock and get the 4g back is there a way to save the modem and/or other files needed to bring over to another rom?
Ok so here is the image I took of my phone info..
I would have to put my fathers back to stock to see if there are the same... but Im now on 4.0.4 with h/h+ still present. Im gonna do a hard factory reset to get the 4G back and then see about trying other things.

spenny88 said:
Ok so the baseband is I747MVLDLK4 and build version is 2.4? lol
I will unroot and flash back to 4.0.4 with a factory reset and then update this post.
Really appreciate ur help
Btw.. I downloaded the whole odin/telus stock tar md5 and recovery about a year ago and have been using that for both of our phones. I will update in a coupke of hours
Also, when I flash back to stock and get the 4g back is there a way to save the modem and/or other files needed to bring over to another rom?
Click to expand...
Click to collapse
TW ROMs display H+ as 4g, and LTE as 4g LTE
AOSP ROMS display H+ as H+ and LTE as 4g

Craptain Krunch said:
TW ROMs display H+ as 4g, and LTE as 4g LTE
AOSP ROMS display H+ as H+ and LTE as 4g
Click to expand...
Click to collapse
Yes, this I understand... but with the 4G displaying, I get NO fast dormancy causing download issues and on top of that, my download speeds are 11-12000kbps.. when showing h/h+, Im getting half the speeds and constant toggling from 3g/h/h+ is driving me up the wall!!
again, Ive never seen this on my Telus TW roms..
I will be unrooting and going back to stock with odin...then doing a factory reset..it will still show the h/h+ unless I do 1 of 2 things....either do a hard factory reset using *2767*3855#, or by simply doing a Samsung update...then after one of those, 4G will be back and so will my speeds.

spenny88 said:
Yes, this I understand... but with the 4G displaying, I get NO fast dormancy causing download issues and on top of that, my download speeds are 11-12000kbps.. when showing h/h+, Im getting half the speeds and constant toggling from 3g/h/h+ is driving me up the wall!!
again, Ive never seen this on my Telus TW roms..
I will be unrooting and going back to stock with odin...then doing a factory reset..it will still show the h/h+ unless I do 1 of 2 things....either do a hard factory reset using *2767*3855#, or by simply doing a Samsung update...then after one of those, 4G will be back and so will my speeds.
Click to expand...
Click to collapse
general rule of thumb, touchwiz roms cannot be built from source. The only way to mess with these roms is with winzipping and adding apps (i call it bloatware) to be honest, if you want customization go to AOSP. Every single time I use a touchwiz rom no matter how smooth its says it is, I get crashes, bugs, irreversible issues like you have, loss of connectivity, the list goes on. Thats all because of the limitations of not having source code, I would recommend you drop the touchjizz and find an AOSP rom you like, if not, stock rom is the way to go.

aeppacher said:
general rule of thumb, touchwiz roms cannot be built from source. The only way to mess with these roms is with winzipping and adding apps (i call it bloatware) to be honest, if you want customization go to AOSP. Every single time I use a touchwiz rom no matter how smooth its says it is, I get crashes, bugs, irreversible issues like you have, loss of connectivity, the list goes on. Thats all because of the limitations of not having source code, I would recommend you drop the touchjizz and find an AOSP rom you like, if not, stock rom is the way to go.
Click to expand...
Click to collapse
Its cool to prefer something but spouting BS doesn't really make your case convincing.
Sent from my SAMSUNG-SGH-I747 using xda premium

hednik said:
Its cool to prefer something but spouting BS doesn't really make your case convincing.
Sent from my SAMSUNG-SGH-I747 using xda premium
Click to expand...
Click to collapse
I agree.. I'm under the impression its the other way around.

Hey just curious.. I was reading about going back to stock and making a copy of the qcn??
Can anyone confirm that copying this and then injecting it after a flash would work?

hednik said:
Its cool to prefer something but spouting BS doesn't really make your case convincing.
Sent from my SAMSUNG-SGH-I747 using xda premium
Click to expand...
Click to collapse
what did I say that is a spout of BS?

spenny88 said:
Hey just curious.. I was reading about going back to stock and making a copy of the qcn??
Can anyone confirm that copying this and then injecting it after a flash would work?
Click to expand...
Click to collapse
Unless your imei is lost I wouldn't mess with anything involving it unless you have to.
aeppacher said:
what did I say that is a spout of BS?
Click to expand...
Click to collapse
That your opinion is somehow fact. That somehow using a TW rom will just give you bugs and ruin your phone, as if a custom rom doesn't have glaring bugs as well. It's quite awesome the amount of customization that the dev's on the touchwiz rom's are able to inject into their rom's. Anyonr who thinks it's just unzipping files and adding apk's is uninformed. Is it on the level of PA or AOKP of course not but with more customization you add the possibility and almost the certainty that you have bugs and instability. We are quite spoiled on the i747 that we have kt and Task developing rock solid custom rom's. Most out there don't have that pleasure. If a TW rom on here is unstable it's because the dev has fallen short some where. I'd say I fall in this category and I am certainly no dev, just a noob cook. Equating TW rom's from 2.2 to the ones we have now is just fallacy. I do agree not having the source code put's dev's on the
In general I have had to deal with more bugs and instability with custom rom's than I have with a stock based rom (stock meaning what came on the phone). Yet that is not a gripe but merely the fact that I don't like to deal with the little things that pop up on custom rom's, and I prefer the aesthetics of TW. Crazy I know as many find it ugly.

T999L issues

so i bought a T999l a few weeks ago had it unlocked, rooted and activated with my existing t-mobile account. For some reason my 4G never worked with them and after several calls they said because my phone was modified they couldn't help me basically. I started with some of the roms from this link http://forum.xda-developers.com/showthread.php?t=2308514 but ended up going back to stock or prob trying to go back to stock because it still says its modified in status of phone. so i was back to 4.1.2 with uvamb7 kernel. I ended up trying sim cards from different carriers and found out that 4g works with at&t sim cards. so the other day i joined aio and finally had 4glte for the first time on this phone. As the days go by though i started noticing it wasnt keeping 4g or 4g lte when i was moving around. As a matter of fact i have to force it to go 4g or lte by either restarting and getting lucky or by using *#2263# and switching sometimes several times from only lte and gsm to automatic or all lte basebands (which gives me lte but i cant make calls or receive calls apparently) and then switching to automatic. Basically if i get lucky and its getting 4glte on automatic it will be fine until i move to a area where there is no lte then its gone until i force it to go lte again even if i get into a area that has lte/4g. Its like its not automatically detecting its in a 4g/lte area, it just stays on edge until i force it. I then tried the 4.3 rom at this link http://forum.xda-developers.com/showthread.php?p=48399478. I sort of got it working but i think i might have been using the wrong kernel because whenever i restart the phone it doesnt load past the galaxy sIII splash screen. If i dont restart however it works but same issue i have to force it to detect when its in a 4g or lte area. So since that wasn't working too well i went back to the stock 4.1.2 setup. So im thinking is this an issue with my antenna or something? I'm still learning this phone so any input would be appreciated. Thanks in advance

If your had updated to stock 4.3 and if the latest version from Samsung contains KNOX in t999l variant, follow this step !
reboot into recovery mode and clear the cache and restart the phone! this should work..!
Sent from my SGH-T999 using Tapatalk
---------- Post added at 12:07 PM ---------- Previous post was at 12:02 PM ----------
If you had updated to stock 4.3 and if the latest version from Samsung contains KNOX in t999l variant, follow this step !
Reboot into recovery mode and clear the cache and restart the phone! this should work..! Make sure you don't root the phone after this...
Sent from my SGH-T999 using Tapatalk

ramkumar19890 said:
If your had updated to stock 4.3 and if the latest version from Samsung contains KNOX in t999l variant, follow this step !
reboot into recovery mode and clear the cache and restart the phone! this should work..!
Sent from my SGH-T999 using Tapatalk
---------- Post added at 12:07 PM ---------- Previous post was at 12:02 PM ----------
If you had updated to stock 4.3 and if the latest version from Samsung contains KNOX in t999l variant, follow this step !
Reboot into recovery mode and clear the cache and restart the phone! this should work..! Make sure you don't root the phone after this...
Sent from my SGH-T999 using Tapatalk
Click to expand...
Click to collapse
How did you unlock it? Please share. Thanks!

tomprc said:
How did you unlock it? Please share. Thanks!
Click to expand...
Click to collapse
i second this!

tomprc said:
How did you unlock it? Please share. Thanks!
Click to expand...
Click to collapse
i payed 6 bucks on ebay to have it remotely unlocked

ramkumar19890 said:
If your had updated to stock 4.3 and if the latest version from Samsung contains KNOX in t999l variant, follow this step !
reboot into recovery mode and clear the cache and restart the phone! this should work..!
Sent from my SGH-T999 using Tapatalk
---------- Post added at 12:07 PM ---------- Previous post was at 12:02 PM ----------
If you had updated to stock 4.3 and if the latest version from Samsung contains KNOX in t999l variant, follow this step !
Reboot into recovery mode and clear the cache and restart the phone! this should work..! Make sure you don't root the phone after this...
Sent from my SGH-T999 using Tapatalk
Click to expand...
Click to collapse
i found a t-moblile 4.3 firmware update last night and flashed it using odin. Seems like its not rooted anymore since i'm getting the stock recovery now. I assume wipe cache partition is the same thing right? so i did that and restarted the phone. 4g lte came right up. I make a call and it drops to 4g which is fine considering before it would drop all my data during a call. Here is the thing though after the call it shows full 4g for a couple seconds then no bars, nothing. No data no network and it will consistently do this . im starting to think this phone is possessed

Stop flashing stuff. Odin to stock (4.3 if you have ever flashed 4.3 via odin, 4.1.2 otherwise) and bring it in.
Also, make sure you use the right firmware, or you will hard brick. If you have never flashed 4.3 via Odin, use MB7. If you have flashed 4.3 via Odin, use MK4.
No amount of flashing random stuff will fix your nv data.
Sent from my T999L on PACman

Adreaver said:
Stop flashing stuff. Odin to stock (4.3 if you have ever flashed 4.3 via odin, 4.1.2 otherwise) and bring it in.
Also, make sure you use the right firmware, or you will hard brick. If you have never flashed 4.3 via Odin, use MB7. If you have flashed 4.3 via Odin, use MK4.
No amount of flashing random stuff will fix your nv data.
Sent from my T999L on PACman
Click to expand...
Click to collapse
I did flash MK4 and i bought this phone off ebay. I don't have a warranty with it. Where exactly am i bringing it in to?

If you have the t999L it has warranty... Hasn't been out long enough for warranty to run out
Bring it in to your carrier (tmo?) And have them reprovision it. It sounds like bad nv data, and unless you have a good backup, the carrier is the only one that can fix that.
Sent from my T999L on PACman

I have the same issue
scaredem23 said:
so i bought a T999l a few weeks ago had it unlocked, rooted and activated with my existing t-mobile account. For some reason my 4G never worked with them and after several calls they said because my phone was modified they couldn't help me basically. I started with some of the roms from this link http://forum.xda-developers.com/showthread.php?t=2308514 but ended up going back to stock or prob trying to go back to stock because it still says its modified in status of phone. so i was back to 4.1.2 with uvamb7 kernel. I ended up trying sim cards from different carriers and found out that 4g works with at&t sim cards. so the other day i joined aio and finally had 4glte for the first time on this phone. As the days go by though i started noticing it wasnt keeping 4g or 4g lte when i was moving around. As a matter of fact i have to force it to go 4g or lte by either restarting and getting lucky or by using *#2263# and switching sometimes several times from only lte and gsm to automatic or all lte basebands (which gives me lte but i cant make calls or receive calls apparently) and then switching to automatic. Basically if i get lucky and its getting 4glte on automatic it will be fine until i move to a area where there is no lte then its gone until i force it to go lte again even if i get into a area that has lte/4g. Its like its not automatically detecting its in a 4g/lte area, it just stays on edge until i force it. I then tried the 4.3 rom at this link http://forum.xda-developers.com/showthread.php?p=48399478. I sort of got it working but i think i might have been using the wrong kernel because whenever i restart the phone it doesnt load past the galaxy sIII splash screen. If i dont restart however it works but same issue i have to force it to detect when its in a 4g or lte area. So since that wasn't working too well i went back to the stock 4.1.2 setup. So im thinking is this an issue with my antenna or something? I'm still learning this phone so any input would be appreciated. Thanks in advance
Click to expand...
Click to collapse
I have the same problem, I paid 15 dollars to the unlockpros.com to remotely unlock my T999L. they did unlock it but now 4g data in t mobile is gone, it freeces, on aTT I get 4G but it goes on and off.
I spoke to them and they tried to fix it remotely, the 4g finally appeared again on t mobile network but then after restart same problem again, no 4G data on t mobile,
does anyone has a full NV data backup that I can use to restore?
will a NV backup from another gallaxy 3 work on mines??
hope someone can help.

Don't use anyone else's nv data, major problems if they turn their phone on ever, and legal issues.
Just Odin the root66 mb7 full restore. That will put you to 100% stock, but with root. You can then use triangle a way to reset the flash counter and modified status, then bring it in to tmo. Make sure to tell them not to update you, or you are stuck with the new bootloader. They might update you anyway "for your convenience", just FYI.
Sent from my SGH-T999 using XDA Premium 4 mobile app

Anybody ever have issues with apps? I first had an issue with the stock messages app not allowing me to send out texts to a single person. Been having this issue for about 2 months. Have been in touch with T-Mobile repeatedly and they reset the signals and everything each time to no avail. Last rep I spoke with said to bring it in to a T-Mo store and get them to change out the SIM (in case that was the issue) and get them to do a back-up & reset. That too did not help. Eventually I downloaded the Google Messaging app and through that I'm able to send out normal person to person texts again but not through the stock app.
I've also got issues with apps having updated versions yet the updates aren't available in Google Play Store for me to download. For example, on June 27th, NCP Mobile came out with version 1.8, but it's still not showing. I've been in touch with the National Consumer Panel, and they say as long as I'm running Android 4.0 or higher (actually running 4.3, rooted- stock ROM) I should see the update available.
I've also been experiencing issues with Perk apps (namely Perk Browser and Perk Search & Win) not allowing me to sign in via Facebook or with email and password. Password reset links almost never get sent. The 2 times they did finally send me a reset link it directs me to the Perk homepage also on which I cannot sign in. I'm in touch with them regarding these issues too.
The last app (as of right now) that I am experiencing problems with is CSI: Crime Scene. The app doesn't allow me to connect to facebook to play with friends like I do when I'm on facebook.

CM11 No Mobile Network, Mobile Network State Disconnected

Whenever I flash cm 10.2 cm 11 any rom at all I face the problem of no internet. So I go back to stock. I have my baseband, build # important stuff like that. I always have to take out my assert lines. So when I flash any rom the fine line will say;
;Mount
or something like that I delete all the assert lines and I was told to keep assert lines but just change them to my baseband and stuff. Any help would be appreciated. & btw the problem is it says Mobile State: Disconnected. But I'm in service too.

I have the same problem. Been searching for a while and trying different fixes, but doesn't seem to be working. I'm on ATT galaxy S3, tho. If someone's got a working ATT S3 and let me know exactly what ROM, gapp, modem, etc they used, would much appreciate it.

Keyonwise said:
Whenever I flash cm 10.2 cm 11 any rom at all I face the problem of no internet. So I go back to stock. I have my baseband, build # important stuff like that. I always have to take out my assert lines. So when I flash any rom the fine line will say;
;Mount
or something like that I delete all the assert lines and I was told to keep assert lines but just change them to my baseband and stuff. Any help would be appreciated. & btw the problem is it says Mobile State: Disconnected. But I'm in service too.
Click to expand...
Click to collapse
More info is needed, such as carrier. I'm guessing either Virgin Mobile or Boost if you need to remove asserts on any of the pre-unified builds (this would hold true for any ROM that has switched to d2lte from d2spr). If that is the case, then you don't have the correct APN's configured. Also, it usually doesn't hurt to be running the most current modem (MK3 for Sprint, MK5 for VM/Boost). Again, the more info the better, then people don't have to play Twenty Questions in order to get to the heart of the matter.

This may work...
So, after trying countless options that i found on this site, and after dozens of flashing roms, modems, kernels, booloaders, restores, etc... turns out that i was doing everything right and there was nothing wrong with the install or the phone itself. After contacting my carrier (PTEL Mobile) for the third time, (first time they told me they had an outage, second time they told me to set the APN setting correctly - neither of which was incorrect on my end or the cause), they said they will try RESETting the DATA on their end. And guess what - that worked.
If you think you did everything correctly but still not getting data, i suggest you make your provider to do the same, or at least pry them as much as you can about your problem and what they can do about it. I wasted to much time and effort (my poor phone) on this and the solution was simple, and not my fault. Hope this helps others.

Mr. Struck said:
More info is needed, such as carrier. I'm guessing either Virgin Mobile or Boost if you need to remove asserts on any of the pre-unified builds (this would hold true for any ROM that has switched to d2lte from d2spr). If that is the case, then you don't have the correct APN's configured. Also, it usually doesn't hurt to be running the most current modem (MK3 for Sprint, MK5 for VM/Boost). Again, the more info the better, then people don't have to play Twenty Questions in order to get to the heart of the matter.
Click to expand...
Click to collapse
Hiya, I'm currently having the same problem as the OP. Mobile state disconnected but it says I am in service. Using latest version of Philz recovery and I flashed the most recent nightly of the Cyanogenmod 11 -4.4.2 KitKat (April 5th, 2014).Carrier is Virgin Mobile, using Samsung Galaxy SIII SPH-L710. PRL is most recent one 33030 and modem is MK5. I did however, flash the rom without deleting the assert lines, since I did not know I had to delete some assert lines. Any help with this? Thanks.

S0lstice said:
Hiya, I'm currently having the same problem as the OP. Mobile state disconnected but it says I am in service. Using latest version of Philz recovery and I flashed the most recent nightly of the Cyanogenmod 11 -4.4.2 KitKat (April 5th, 2014).Carrier is Virgin Mobile, using Samsung Galaxy SIII SPH-L710. PRL is most recent one 33030 and modem is MK5. I did however, flash the rom without deleting the assert lines, since I did not know I had to delete some assert lines. Any help with this? Thanks.
Click to expand...
Click to collapse
Deleting asserts is only for d2spr specific builds, that doesn't apply to d2lte builds (hence the reference to "pre-unified builds" in my first post). Your issue is most likely also related to APN's. However, there are also known data issues on a lot of the latest CM nightlies, and also on the ROM's that rely heavily on CM as a code source. I would strongly recommend reading the last several pages of the thread for any ROM that falls into this category in order to see what other users are reporting along these lines.

CM11 No Mobile Network
Hey guys,
Noob here. I'm running CM11-20140428-NIGHTLY-jflte on a Galaxy S4 GT-i9507(international, optus) but bootscreen now says 9505(not sure if that's important).
I've had Mobile Network State: Disconnected for the last three nightlies. On CM11 M3 it was working all good, but now no luck.
So I've tried a few things and I've come to the point where I'm going to try the factory reset then reflash CM11 and fingers crossed it will work.
Can anyone talk me through the proper procedure for this? I've made a full backup on my external SD using CWM 6.0.4.7 and transferred it to
computer just in case. So would anyone be awesome enough to take me through it step by step.
Cheers,

hhmmm
Use Rom Manager app and Fix Perrmisson
I install a bunch of roms on my dadz s3 and had 2 DirtyFlash it
And then used Wifi 2 get the app itselfz and it fix'd 88 permission
Idk jus tryn 2 help
Had sumthing 2 do w Gapps causing my issue

CM11 No Mobile Network
Ickyz said:
Use Rom Manager app and Fix Perrmisson
I install a bunch of roms on my dadz s3 and had 2 DirtyFlash it
And then used Wifi 2 get the app itselfz and it fix'd 88 permission
Idk jus tryn 2 help
Had sumthing 2 do w Gapps causing my issue
Click to expand...
Click to collapse
Just Fixed Permissions using Rom Manager, still no good.

Stock no APN settings at all
I have looked everywhere and found nothing for the last 3 weeks. I have a stock, sprint S3 on straight talk (my son's phone) it will not get 4g lte data what so ever. My phone is the exact same phone, and it does get 4g lte data. I tried all the basics ##72786# data on off check airplane mode...nothing. Mobile network state is "disconnected". So I opened data ##3282# to compare apn settings with my phone. I made sure everything matched, and when I get to "LTE APN Settings" I open it up, and nothing is there except APNs nothing, blank. Also missing is "Dial Up Networking" that option does not exist on my son's phone. He updated to kitkat (uggh) but the problem was present before that. Checked the phone, and it is not rooted. Funny thing is the phone updates with 4g lte running after dialing ##72786#, but that goes away after it completes. Texting works, but no mms (pictures etc.) and if I set it to cdma only it gets 3g, otherwise no data at all. Anybody?

[Q] CM11.0, 20140608, M7 Snapshot - Unable to get signal from radio

I started to experiment with different custom ROMs available for the d2att (now, apparently called the d2lte). My phone is using TeamWin 2.6.3.1 for recovery, I have been using it for everything. So far I have only been familiar with two certain ROMs: Cyanogenmod and CarbonROM. I have not flashed anything except for the recovery.
I complete the installation of my new ROM by first wiping cache, dalvik, data and system. My ROMs are stored on an external SD.
CarbonROM was the first one to be installed, but I found it quite buggy and unstable. I have since been using different snapshots of CM to test functionality and stability...since I plan to hang up my LG G2 and start using my SGS3 w/7200mAh battery as my daily phone. So it needs to be very reliable. I also enjoy picking with settings so the more settings the better.
So, question number #1:
When I install CM the normal way, add my APN, and select the proper mobile network mode, how come I cannot get a signal, no matter what I try? I have searched around many forums for the answer to this...many have nothing to do with my problem or are using different phones. I can confirm my SIM card works, as it was used in my LG G2. Carrier is Virgin Mobile Canada. Network mode is GSM/WCDMA Auto. It does not work with any other modes including Global.
Q #2:
If I plan on using custom KK (4.4.2) ROMs, is there anything extra I need to flash to the phone in order for the cell radio to work successfully? When I researched this, I found lots of people talking about flashing a custom bootloader, but I could not find an exact answer to my question. I would rather not brick my phone by attempting this blindly.
Q #3:
Since I am looking for a reliable custom ROM, is CM the best developer to choose? Is there a more reliable ROM out there?
Mike
EDIT: I did more reaseach on bootloaders and modem firmware and found that my bootloader is already at the most recent version. I did find however that my modem firmware was out of date, so I updated from UEMK5 to UEND3. This however did not solve my problem as I still have no service...
I am contemplating now about starting from scratch and wiping my internal storage... will this help or is it unnecessary?

For question # 1, do you have a proper imei after installing CM11? You can check it in the dialer by typing in *#06#.
For question #2, the modem must be compatible with the bootloader. Custom ROMs will only install if the phone has a compatible bootloader.
For question #2, I prefer Validus which is an AOSP-based ROM.

audit13 said:
For question # 1, do you have a proper imei after installing CM11? You can check it in the dialer by typing in *#06#.
For question #2, the modem must be compatible with the bootloader. Custom ROMs will only install if the phone has a compatible bootloader.
For question #2, I prefer Validus which is an AOSP-based ROM.
Click to expand...
Click to collapse
I have an IMEI number. That is what has me kind of confused...everything is there to show signal, it's just that it will not pick up a tower. When I throw a SIM card in it recognizes it. One thing to also mention is it pins the signal at 0, -1, or 258692378... or another outrageous number.

First things first have you followed the method of going back to a stock TW ROM, obtaining a GPS lock, and then flashed your Custom KitKat rom?
Sent from Mission Control

UnknownTroll1 said:
First things first have you followed the method of going back to a stock TW ROM, obtaining a GPS lock, and then flashed your Custom KitKat rom?
Sent from Mission Control
Click to expand...
Click to collapse
I am now on stock 4.3 firmware. I have obtained a GPS lock.
No service at all.
But... I had a funny feeling, so I went into stock android recovery and wiped cache...and voila, service!
Only problem is, I'm losing it almost constantly. The only way to fix it is by wiping the cache, but I can't keep doing that whenever I lose service.
Will I be okay to flash the custom recovery and custom ROM at this point?

Do you have the latest modem installed?

mpelley92 said:
I am now on stock 4.3 firmware. I have obtained a GPS lock.
No service at all.
But... I had a funny feeling, so I went into stock android recovery and wiped cache...and voila, service!
Only problem is, I'm losing it almost constantly. The only way to fix it is by wiping the cache, but I can't keep doing that whenever I lose service.
Will I be okay to flash the custom recovery and custom ROM at this point?
Click to expand...
Click to collapse
If you are still on the Stock TW ROM here is a method to try. It will clear most of your mobile data problems.
1. Enter the Samsung service mode by typing this code into the dial pad *#197328640#
2. Then go to Mainmenu>UMTS>Common>NV REBUILD>NV REBUILD> (Important: don't exit the menu yet!)
3. Wait 30+ sec
4. Long press power button and select "Restart / Reboot"
5. Now check your GPS from any software that may use GPS like "Maps" or "GPS Status"
Credit: S3Rx ROM Development Thread.
EDIT: Afterwards you should be good to go on your custom ROM. This issue seems to have arisen when a d2lte build broke most people's LTE/Mobile data.
Sent from Mission Control

UnknownTroll1 said:
If you are still on the Stock TW ROM here is a method to try. It will clear most of your mobile data problems.
1. Enter the Samsung service mode by typing this code into the dial pad *#197328640#
2. Then go to Mainmenu>UMTS>Common>NV REBUILD>NV REBUILD> (Important: don't exit the menu yet!)
3. Wait 30+ sec
4. Long press power button and select "Restart / Reboot"
5. Now check your GPS from any software that may use GPS like "Maps" or "GPS Status"
Credit: S3Rx ROM Development Thread.
EDIT: Afterwards you should be good to go on your custom ROM. This issue seems to have arisen when a d2lte build broke most people's LTE/Mobile data.
Sent from Mission Control
Click to expand...
Click to collapse
I am still unable to get service. This time it is pinned at -113. I am although, registered on a network. Not able to make calls or text.

mpelley92 said:
I am still unable to get service. This time it is pinned at -113. I am although, registered on a network. Not able to make calls or text.
Click to expand...
Click to collapse
Yea at this point I am stumped. I guess its a hardware issue. But before calling quits what is your baseband and boot loader?
Sent from Mission Control

UnknownTroll1 said:
Yea at this point I am stumped. I guess its a hardware issue. But before calling quits what is your baseband and boot loader?
Sent from Mission Control
Click to expand...
Click to collapse
Bootloader and baseband: I747MVLUEMK5

mpelley92 said:
Bootloader and baseband: I747MVLUEMK5
Click to expand...
Click to collapse
You're running the most recent release so I'm not sure what's causing the issue.

audit13 said:
You're running the most recent release so I'm not sure what's causing the issue.
Click to expand...
Click to collapse
I have found the problem with the service. I live in an area where signal is not too great. My LG G2 has a tendency to pick up the correct tower for my area, but my Galaxy S3 does not choose the same tower... It looks for one in a completely different direction.
Forgive me, this thread is going to take a bit of a turn.
Is there any way to choose which cell tower the phone connects to? In my area there is one directly east and the other is directly west. I need the western tower in order to make/receive calls/text and in order to get any data reception. Right now where my phone sits, it does not connect to the western tower so I cannot use it. I used OpenSignal to observe which tower both phones connect to.
The other issue I found is my extended battery (Anker 7200) also interferes with reception quite a bit. In town, it's not noticeable. But out on my acreage it stops my phone from getting any signal. I compared it to my LG G2 and my Galaxy S3 with the old 2100mAh battery. The G2 hovers around -95, S3 w/OEM battery at -101 and the S3 w/Anker battery at -113 (no service).
Mike

mpelley92 said:
Is there any way to choose which cell tower the phone connects to? In my area there is one directly east and the other is directly west. I need the western tower in order to make/receive calls/text and in order to get any data reception. Right now where my phone sits, it does not connect to the western tower so I cannot use it. I used OpenSignal to observe which tower both phones connect to.
Mike
Click to expand...
Click to collapse
Try changing the mode to LTE only under your settings. This may force the stronger connection.

x0ne215 said:
Try changing the mode to LTE only under your settings. This may force the stronger connection.
Click to expand...
Click to collapse
Unfortunately that won't work either. In my area I can only pick up HSPA....

mpelley92 said:
Unfortunately that won't work either. In my area I can only pick up HSPA....
Click to expand...
Click to collapse
Hmm. Out of curiosity, have you tried a different ROM on 4.4.2? I've had weird issues with ROMs and signal, ie MIUI caused me to have my signal cut in and out at random intervals. Worth a shot at least. I've been using SlimKat if you want one for reference (probably the quickest download due to size).
Unfortunately all I can suggest is trying to play with tasker and seeing if you can get it to skip over the crap tower, but to my knowledge there's no way to prevent connection to said tower.
I guess if you wanna get into a gray area you could modify said tower....but I claim no responsibility for your actions with that

x0ne215 said:
Hmm. Out of curiosity, have you tried a different ROM on 4.4.2? I've had weird issues with ROMs and signal, ie MIUI caused me to have my signal cut in and out at random intervals. Worth a shot at least. I've been using SlimKat if you want one for reference (probably the quickest download due to size).
Unfortunately all I can suggest is trying to play with tasker and seeing if you can get it to skip over the crap tower, but to my knowledge there's no way to prevent connection to said tower.
I guess if you wanna get into a gray area you could modify said tower....but I claim no responsibility for your actions with that
Click to expand...
Click to collapse
I've been using Liquidsmooth the past few nights and am losing signal more than ever.
Would the OS control how the modem is used? I would think that it's hardware only that changes how and when you get service.
I'm going to try the UEND3 modem firmware and see if that makes a difference. Also going to try SlimKat like you suggested.