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

No phone service

I can not get any radio to work to make or receive calls! I flashed everyone out there and still can not make or receive calls. What method can I use do to get it to work? I flashed radio from TWRP with Factory reset, delvik and cache and then flash with no wipe and I just cant get that or any radio to work. I just get AT&T when I do a scan, which I use T-Mobile. When I choose search in settings in mobile networks, still nothing. When I try to use phone, it always says no network avail. and yes I have data box checked off. It just seams lately any Rom I flash after the newest stock, (JB) I have radio issues, can not make or receive calls. I even erased, wiped everything and started from scratch with stock. Phones works fine, but when I try any ROM, no calls, no matter what radio I flash. I must be doing something wrong. I must say, that I flashed many a Roms before and all worked well until now! I even download same radios in case I got a bad download. I can use kernels, such as Tiberius with Stock JB. I Flash a Rom and no radio, no matter what Rom. My version in stock is UVMC6, SGH T-989 phone. (T-Mobile). I know all phones are different and thought maybe something in stock files I might be able to use, but don't know which files. I am not a dev by any means and thought if I could use the stock I have now can work with the any Rom here. I never dirty flash anything, all Roms work that I flash from sd card, just not able to use phone in any Rom at all! I thought maybe I can manually put in APN, but I have no idea were to get address to enter. I am from Delaware if that matters as far as APN. Can anyone give any suggestions of what they did to get radio to work?

Sargeue said:
I can not get any radio to work to make or receive calls! I flashed everyone out there and still can not make or receive calls. What method can I use do to get it to work? I flashed radio from TWRP with Factory reset, delvik and cache and then flash with no wipe and I just cant get that or any radio to work. I just get AT&T when I do a scan, which I use T-Mobile. When I choose search in settings in mobile networks, still nothing. When I try to use phone, it always says no network avail. and yes I have data box checked off. It just seams lately any Rom I flash after the newest stock, (JB) I have radio issues, can not make or receive calls. I even erased, wiped everything and started from scratch with stock. Phones works fine, but when I try any ROM, no calls, no matter what radio I flash. I must be doing something wrong. I must say, that I flashed many a Roms before and all worked well until now! I even download same radios in case I got a bad download. I can use kernels, such as Tiberius with Stock JB. I Flash a Rom and no radio, no matter what Rom. My version in stock is UVMC6, SGH T-989 phone. (T-Mobile). I know all phones are different and thought maybe something in stock files I might be able to use, but don't know which files. I am not a dev by any means and thought if I could use the stock I have now can work with the any Rom here. I never dirty flash anything, all Roms work that I flash from sd card, just not able to use phone in any Rom at all! I thought maybe I can manually put in APN, but I have no idea were to get address to enter. I am from Delaware if that matters as far as APN. Can anyone give any suggestions of what they did to get radio to work?
Click to expand...
Click to collapse
Verify your APN settings are correct. If there isn't a t mobile APN set up than try creating one. Also go to Settings > About Phone > Status and make sure your phone has a valid IMEI number (anything other than 0)
Sent from my SGH-I747 using xda app-developers app

KorGuy123 said:
Verify your APN settings are correct. If there isn't a t mobile APN set up than try creating one. Also go to Settings > About Phone > Status and make sure your phone has a valid IMEI number (anything other than 0)
Sent from my SGH-I747 using xda app-developers app
Click to expand...
Click to collapse
Thanks, yeah after all reading and troubleshooting it seems APN is where I have to create and/or edit! I found APN settings on Google and wrote down the settings that is on stock Rom where phone is working and will try it. Thanks for heading me in the right direction.

Sargeue said:
Thanks, yeah after all reading and troubleshooting it seems APN is where I have to create and/or edit! I found APN settings on Google and wrote down the settings that is on stock Rom where phone is working and will try it. Thanks for heading me in the right direction.
Click to expand...
Click to collapse
Glad to help.
Sent from my SGH-I747 using xda app-developers app

I'm in Canada and had same problem with SlimBean ROM (which is my favourite ROM). I flashed phone back to a stock ROM, flashed DARKSIDE.SUPER.WIPE, the ROM, and Gapps with TWRP recovery (in that order) and was back in business.
T989D
TWRP 2.4
SlimBean ROM 3.4

Deacon75 said:
I'm in Canada and had same problem with SlimBean ROM (which is my favourite ROM). I flashed phone back to a stock ROM, flashed DARKSIDE.SUPER.WIPE, the ROM, and Gapps with TWRP recovery (in that order) and was back in business.
T989D
TWRP 2.4
SlimBean ROM 3.4
Click to expand...
Click to collapse
Still no radio, will try your way, thanks!

[Q] Mobile data suddenly dropped

I'm running CM-10.1.3 (stable) on my phone (T999) with the UVMD5 modem and last night I lost all signal for about 30mins. I rebooted a few times and toggled air plane mode on and off without any success. Eventually, I got signal again but no data. I can send and receive calls and SMS but I have no data connection (can't browse, no email notifications, etc.). I have tried all the options under the Network Mode settings without any success. Occasionally, I'll see the "E" sign for Edge/2G but there is no data available even then. I also tried updating the modem to UEMJ4 and UEMJC but observed no changes. WiFi works just fine. Could this be a hardware issue? Is the antenna somehow damaged? Is there anything else I could try?

Try another Kernel. If that does not help, Odin flash to Stock. If that too doesn't work then suspect tower issue.
Hardware is a possibility. But lets not get ahead of ourselves

Thanks, I'll give that a shot and report what I find. I doubt that it's tower related since I'm having the same issue at home and at work and my roommate, who has an original Galaxy and is also on Tmobile, is not having any problems.

I flashed stock JB 4.1.2 (UVDMD5) using Odin since I had it laying around and I'm still seeing the same issue. What else can I try?

EvilBoz said:
I flashed stock JB 4.1.2 (UVDMD5) using Odin since I had it laying around and I'm still seeing the same issue. What else can I try?
Click to expand...
Click to collapse
Check your APNs. Those are under Settings > Advanced > Network. Its called Access Point Names. It should be set to epc.t-mobile.com. See this thread for details.
Try UVDLJC or the prior version to MD5. If that too does not help then take to T-mo for antenna Repair.

Check your IMEI number. If it is zeroed out PM me. Otherwise just let us know here, (but don't actually post it).

DocHoliday77 said:
Check your IMEI number. If it is zeroed out PM me. Otherwise just let us know here, (but don't actually post it).
Click to expand...
Click to collapse
The IMEI is 0. I never backed up the EFS folder but I was able to get the number from tmobile.

I have been having the same issue since June 2013 after doing to 4.1.2 OTA update from T-Mobile, at the time I didn't realize the IMEI was listed as unknown. So for months I have not gotten a cellular data connection better than Edge. Also after that update trying to check for a software update on the phone resulted in an error, and Kies told me my firmware was not supported for upgrade. Looking in some support forums and talking to T-Mobile got me nowhere, so I have just been dealing with it.
Wanting to upgrade I recently used Odin to load the official T-Mobile 4.3 ROM on the phone, actually hoping that would fix my issue (still in the dark about IMEI) which it did not.
I had never backed up the EFS folder, since as a standard user I had no idea what it was and while performing an update from my provider I didn't realize anything would need to be backed up outside of Kies. Now that my warranty is expired and having to take matters into my own hands I am on a quest to find a fix, however I don't want to "brick" my phone in the process, at this point I know enough to be dangerous.
Currently;
Android 4.3 Official T-Mobile ROM
BASEBAND is good T999UVUEMJC
Kernel 3.0.31-1962493
IMEI is Unknown
Looking at some other posts here at xda-developers I tried to follow some instructions on repairing or restoring IMEI using NV reader/writer, however I cannot get NV reader/writer to connect to my phone.
I have noticed in 4.3 when using *#7284# in the dialer the QualComm settings are no longer present, only MODEM and PDA are available.
I have poked around in Service Mode *#197328640# and found a setting that I thought might help, but I have a feeling it is the same thing as 8#7284#
[1] UTMS > [6] COMMON > [4] DIAG CONFIG > [1] USB or [2] UART
So at this point I don't know how to proceed, again I am not thrilled about loading a custom ROM, or really any ROM for fear of making the issue worse or bricking the phone. I have read a lot of posts about no longer being able to make calls due to IMEI issues. Everything works right now except cellular Data.

[Q] Can't send sms and greyed bar after cm 10.2

Hello fellow xda members. Well after searching for a solution for my for nearly a week now i figure i should post the question to see if i can get an answer. I did search around before hand and tried many solutions but to no avail.
Background, I have a sgh-t999 that's apparently unlocked since I've been using a fido sim card in it for several months now. when ever I'm running cm 10.1, I have full network access, texts, mms, 3g data, etc.Note: d2mtr is flashed to my phone and my model number gets changed to sch-r530, baseband: t999vvllh2.
After flashing to cm 10.2 RC1. d2mtr. I get stuck on the metroPcs network with out any way to manually switch network operators because the option in mobile networks is greyed out. Everything seems to work fine in terms of calls but besides being able to receive texts messages i can't send them. The signal bar seems to be empty or greyed out yet it still picks up 3g data. I've vigorously checked my apn settings to no avail. deleted the voice+ apk since I'm not in the US being in Canada and i'm all out of options right now. If i restore back to my previous backup ,everything works fine and i did check to see if I loose my imei number after flash.
I previously tried flashing d2tmo to my device but to no avail, assert errors. It would greatly be appreciated to get a response and thank you in advance for any help.
Edit: It's a sgh-t999v as printed behind the battery. I followed this guide http://forum.xda-developers.com/showthread.php?t=1775616 hence the reason why I'm coming from ICS. Looks like I'll have to reflash using ODIN which i was trying to avoid out of fear of bricking but it seems like my only option now.

kyuubie said:
Hello fellow xda members. Well after searching for a solution for my for nearly a week now i figure i should post the question to see if i can get an answer. I did search around before hand and tried many solutions but to no avail.
Background, I have a sgh-t999 that's apparently unlocked since I've been using a fido sim card in it for several months now. when ever I'm running cm 10.1, I have full network access, texts, mms, 3g data, etc.Note: d2mtr is flashed to my phone and my model number gets changed to sch-r530, baseband: t999vvllh2.
After flashing to cm 10.2 RC1. d2mtr. I get stuck on the metroPcs network with out any way to manually switch network operators because the option in mobile networks is greyed out. Everything seems to work fine in terms of calls but besides being able to receive texts messages i can't send them. The signal bar seems to be empty or greyed out yet it still picks up 3g data. I've vigorously checked my apn settings to no avail. deleted the voice+ apk since I'm not in the US being in Canada and i'm all out of options right now. If i restore back to my previous backup ,everything works fine and i did check to see if I loose my imei number after flash.
I previously tried flashing d2tmo to my device but to no avail, assert errors. It would greatly be appreciated to get a response and thank you in advance for any help.
Click to expand...
Click to collapse
Might not be the right ROM for your phone. Or it could be buggy. I've messed around with a few and finally found a great one that seems to be working well for me. I have the d2ltetmo. I'm running Liquid Smooth ROM with 4.2.2 and TWRP 2500 recovery. The ROM roots your phone as well. Any questions feel free to ask. Hope I can help!:cyclops:

I wouldn't flash D2MTR Rom to D2TMO. Too many differing things. There's a CM for D2TMO too.

Are you sure that's a t999? The baseband looks like the one for the t999v.. And it also looks like you might be on ICS firmware.. What I suggest you do is check the model number of your phone to be sure what model you have, after that update to 4.1.1 or 4.1.2 via Odin but make sure its the firmware for your model. After this flash your custom recovery, and then try flashing cm10.1 for d2tmo.. If your device bootloops after you Odin, enter recovery and do a factory reset.
Edit: check the model number by removing the battery and it will say at the back of the phone.. And the firmwares to flash in odin are in the development thread
Sent from my SGH-T999 using Tapatalk

serio22 said:
Are you sure that's a t999? The baseband looks like the one for the t999v.. And it also looks like you might be on ICS firmware.. What I suggest you do is check the model number of your phone to be sure what model you have, after that update to 4.1.1 or 4.1.2 via Odin but make sure its the firmware for your model. After this flash your custom recovery, and then try flashing cm10.1 for d2tmo.. If your device bootloops after you Odin, enter recovery and do a factory reset.
Edit: check the model number by removing the battery and it will say at the back of the phone.. And the firmwares to flash in odin are in the development thread
Sent from my SGH-T999 using Tapatalk
Click to expand...
Click to collapse
Well after a long process of flashing stock jb then finding a proper method of flashing cwm since i had difficulties with fastboot and went with the dd if-of method using the terminal emulator. I am finally on a stable cm 10.2 rom, d2tmo, where everything seems to be working and intact. Thanks for the advice now i have the long process of restoring my apps and data and what not with titanium backup.

HELP! Having a bunch of connectivity issues.

Hey guys, i'm having a bunch of connectivity issues, all revolving around cell service. WiFi works greats. First issue is that text message get sent and received sporadically(meaning sometimes i send texts and they send right away, while other times they fail and require a few resends). Second issue is incoming calls not reaching my device(doesn't even ring on my phone) and going straight to voicemail after 2 rings/outgoings calls not ringing at all. Last and hopefully least, data seems to drop or hang on upload after a few minutes of use. Now all these issues occur sporadically and at seemingly random times, but it seems like once one of these 3 issues occur, they all get triggered.
I've checked and reset APN settings and they seem correct, although instead of "Not Set" for the username, there is "none" and there is a four digit password that has been censored by *, and for Server there is one digit *.
I've called T-MO customer service and their suggestion to solving it was a Master Reset, which is essentially a Factory Reset including wiping the Internal SD card. I've yet to do this, but i have tried a regular Factory Reset from TWRP, but the issue still persists. Not sure what to do at this point, was considering ODIN'ing back to stock(4.1.1 root66 to be exact).
If it matters, I'm running Dandroid 4.1.2, with DLJA baseband and stock kernel. Sometimes rebooting or flipping airplane mode on/off fixes it for a couple more minutes.
Any insight or suggestion would be GREATLY appreciated. Thanks for taking the time to read this.

I had this problem on my Nexus 5 and it seems to be sorted out now. But I'd highly recommend ODINing to the latest stock if you change your baseband radio and you're still experiencing the same issue. (I'm also a T-Mobile customer)
Also, I recommend heading to the market and downloading Offline SIM APN Database to verify you have the entirely correct APN.

Hey, thanks for the swift reply. Firstly, i checked the offline sim database and my APN settings match those, so hopefully APN settings are out of the question. And by latest, are you referring to 4.3? Also, i don't think i've ever flashed a radio/modem of any kind, and my baseband has been DLJA since i first bought this phone ~1 year ago.

I believe so that 4.3 is latest.

Before flashing 4.3, make sure you Sim unlock the phone first.
It sounds to me like its probably one of the following causing your issues....
Bad SIM card
Network problems on T-Mobile's end
Corrupted firmware or data
Or just part of the actual hardware going bad
(Listed what I think is most likely first)
Go to a T-Mobile store and ask an employee if they can test your device with their sim, or better yet, since its random ask if they can just replace yours.
Call T-Mobile to ask if there are any known problems in your area. If not ask if they can reset your account.
Flashing firmware with Odin (not mobile odin) can help determine if it may be a hw or sw problem. I do recommend factory resetting with stock recovery though. This actually formats /data, where custom recoveries just selectively delete things.
If its still giving problems after all of the above, its a pretty good chance some piece of hw has gone bad.

Thanks the replies guys, I'll report back with some results. Just wanna add, I've tried my sister's S4 LTE Sim on my phone and the issue still seems to occur regardless.
Sent from my SGH-T999 using Tapatalk 4

TheKucho said:
Hey guys, i'm having a bunch of connectivity issues, all revolving around cell service. WiFi works greats. First issue is that text message get sent and received sporadically(meaning sometimes i send texts and they send right away, while other times they fail and require a few resends). Second issue is incoming calls not reaching my device(doesn't even ring on my phone) and going straight to voicemail after 2 rings/outgoings calls not ringing at all. Last and hopefully least, data seems to drop or hang on upload after a few minutes of use. Now all these issues occur sporadically and at seemingly random times, but it seems like once one of these 3 issues occur, they all get triggered.
I've checked and reset APN settings and they seem correct, although instead of "Not Set" for the username, there is "none" and there is a four digit password that has been censored by *, and for Server there is one digit *.
I've called T-MO customer service and their suggestion to solving it was a Master Reset, which is essentially a Factory Reset including wiping the Internal SD card. I've yet to do this, but i have tried a regular Factory Reset from TWRP, but the issue still persists. Not sure what to do at this point, was considering ODIN'ing back to stock(4.1.1 root66 to be exact).
If it matters, I'm running Dandroid 4.1.2, with DLJA baseband and stock kernel. Sometimes rebooting or flipping airplane mode on/off fixes it for a couple more minutes.
Any insight or suggestion would be GREATLY appreciated. Thanks for taking the time to read this.
Click to expand...
Click to collapse
Funny that I came across this. I was experiencing (seemingly) the exact same problem very recently. I even picked up a new SIM card, but that didn't fix it. I was beginning to fear it was hardware related. But like Doc suggested, I used ODIN to flash stock fw, and all is well again. It appears that my problem was related to data corruption. Thought I'd post to confirm returning to stock via ODIN fixed the issue for me - in case it happens to anyone else.

Ditamae said:
Funny that I came across this. I was experiencing (seemingly) the exact same problem very recently. I even picked up a new SIM card, but that didn't fix it. I was beginning to fear it was hardware related. But like Doc suggested, I used ODIN to flash stock fw, and all is well again. It appears that my problem was related to data corruption. Thought I'd post to confirm returning to stock via ODIN fixed the issue for me - in case it happens to anyone else.
Click to expand...
Click to collapse
Thanks for the reply! Unfortunately I'm still experiencing this problem. May I ask which Android version you ODIN'd? If 4.3, MJC or NC2? I've ODIN'd two firmwares, 4.1.1 LJA and 4.1.2 MD5. I've held back on doing 4.3 because I know after that, there is no way back. But if that fixes the issue, I'm all in. Thanks!
Sent from my SGH-T999 using Tapatalk 4

TheKucho said:
Thanks for the reply! Unfortunately I'm still experiencing this problem. May I ask which Android version you ODIN'd? If 4.3, MJC or NC2? I've ODIN'd two firmwares, 4.1.1 LJA and 4.1.2 MD5. I've held back on doing 4.3 because I know after that, there is no way back. But if that fixes the issue, I'm all in. Thanks!
Sent from my SGH-T999 using Tapatalk 4
Click to expand...
Click to collapse
I used UVDLJA 4.1.1, and so far I'm free of the connection issue. I feel the same as you... don't want to flash 4.3 without being able to downgrade. I picked the LJA fw because that's what my phone shipped with, and the radio/bootloader combo always worked well for me. Sorry it hasn't worked for you! Maybe a stupid question, but did you factory reset after ODIN flashing?
Out of curiosity, did the issue resurface while you were still running stock fw? Or had you changed ROMs?

Ditamae said:
I used UVDLJA 4.1.1, and so far I'm free of the connection issue. I feel the same as you... don't want to flash 4.3 without being able to downgrade. I picked the LJA fw because that's what my phone shipped with, and the radio/bootloader combo always worked well for me. Sorry it hasn't worked for you! Maybe a stupid question, but did you factory reset after ODIN flashing?
Out of curiosity, did the issue resurface while you were still running stock fw? Or had you changed ROMs?
Click to expand...
Click to collapse
Yeah, I've factory reset from the stock recovery and had everything wiped. Well first the issue initiallly surfaced on the Dandroid 4.1.2 ROM, but I had ran that ROM for close to a year without any issues, then all of a sudden it happened. I ODINd the 4.1.1 and factory reset and at first I thought it worked but a few minutes later, the problem resurfaced, so to answer your question, yeah it still happened on stock fw. I may try it again just in case I take it in to a T-Mobile store.
Sent from my SGH-T999 using Tapatalk 4

Well since you ruled out the SIM card already, the 2nd part I mentioned would be my next suspect. (Network problems on T-Mobile's end. )
Is there any way you can get maybe 5-10 miles away from your usual locations and test there? (Remember to reboot after making it to a new location). If its still giving problems there, its very unlikely to be a tower problem. (Still possible, but very unlikely. ) Also, call T-Mobile support and ask if they can perform a reset on your account. (Can't remember what they call it exactly, but they should be able to take some sort of similar action on your account from their end.)
Finally, if you are still running 4.1.2 or 4.1.1 firmware, you can try flashing the different modems I have in my baseband thread. (Stickied in development). I can't remember right now if the 4.3 modems will work on the older firmware, but its ok to try them all. Once you update to 4.3 you can no longer use the older modems.
If, after all of that, you still are having trouble, you can pretty much rule out network problems. It'd still be a possibility, but only a very unlikely one.
After this, you might want to seriously consider flashing the MJC firmware, then NC2 if necessary. If none of that is helping I don't think there will be much more you can really do....