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

[Q] 3G mobile data is not working

I've flashed Xperia Z Jelly Bean v4 (this one http://forum.xda-developers.com/showthread.php?t=2267230&highlight=data) on my Arc S and I can say its so fast and so beautiful.
The only problem I have is that I cant connect to mobile data 3G however my APN settings are correct
I flashed BB-77 too as recommended by one of the users in the thread and it didnt work as well
So what should I do now ?
Thanks

Were you able to use the 3G connection before this ROM?
My current advice - Ask from your operator, if the 3G connection is enabled for you.

Someguyfromhell said:
Were you able to use the 3G connection before this ROM?
My current advice - Ask from your operator, if the 3G connection is enabled for you.
Click to expand...
Click to collapse
Are you sure you have "Data enabled"? Try to reboot your phone.

Someguyfromhell said:
Were you able to use the 3G connection before this ROM?
My current advice - Ask from your operator, if the 3G connection is enabled for you.
Click to expand...
Click to collapse
Yes I was able to use 3G before this ROM and i contacted my operator and 3G is enabled already
Does that have anything to do with the baseband ??

ChillToucH said:
Are you sure you have "Data enabled"? Try to reboot your phone.
Click to expand...
Click to collapse
Already did that and yes im sure data us enabled

Does this issue have anything to do with the baseband ??

MohamedMordi said:
Does this issue have anything to do with the baseband ??
Click to expand...
Click to collapse
Well, if in the thread you downloaded it from was nothing more to flash, then nop.
I said it because in GB Roms you must flash an additional libraries, but i dont had used CM10 based ROMs so i can just can guess, check the baseband threads.
By the way, sometimes my phone "losses" the data connection for a while (the icon dessapear even if the data connection is active). It just happen like 2 times since a got it, but after some time it comes back.

Flash latest stock 4.0.4 and then install Xperia Z Jelly Bean v4.

17th_angel said:
Well, if in the thread you downloaded it from was nothing more to flash, then nop.
I said it because in GB Roms you must flash an additional libraries, but i dont had used CM10 based ROMs so i can just can guess, check the baseband threads.
By the way, sometimes my phone "losses" the data connection for a while (the icon dessapear even if the data connection is active). It just happen like 2 times since a got it, but after some time it comes back.
Click to expand...
Click to collapse
Well, in the thread I flashed something called Xperia Arc S 4.1.B.1.13 Vodafone DE firmware and they said it's for increasing system and data memory for Arc user and latest BB. You think this is the problem ?!

the phone is not set to gsm only?
look at settings - more - mobile network - uncheck 2g
also look at the accesspoin and choose the right one

Guys please this is really urgent and I did everything I could
Last thing i did was flashing every stock thing on the phone, stock GB, stock kernel, stock baseband and nothing changed and data mobile is still not working

You can try to input the apn by yourself
Sent from my Xperia Arc S using xda app-developers app

already did!
Please guys I need some advanced solution for that. Thanks

[PROBLEM] 3G Doesn't Work!

Hello everyone,
I currently have an issue with my arc S (LT18i) where 3G doesn't work anymore on any Sony stock ROM. I am aware that my carrier supports the needed basebands, and I am in an area where my service has 3G with full signals. I have tried the following:
I have switched ROMs from ICS and Gingerbread & tried reflashing, but still 3G doesn't work. I have no problems with 2G however.
Changing kernels didn't help too. I normally use LuPuS, but the problem still remains.
I first thought it was a hardware issue, but then I switched to CyanogenMOD and MIUI, 3G works on both ROMs. So it's not a hardware issue.
I still do not know what the problem is. Can anyone help me out? This problem occured just after I flashed LuPuS kernel, and then returning back to stock kernel. Ever since then 3G doesn't work.
Hope I get a solution. Help is appreciated. Thanks!

Did you flash the correct baseband for the ROM? Each Android version works with a different baseband.
僕のLT18iから送られてきた

popthosegaskets said:
Did you flash the correct baseband for the ROM? Each Android version works with a different baseband.
僕のLT18iから送られてきた
Click to expand...
Click to collapse
Never had problems with using various basebands on various ROMs. 64 worked fine on ICS, 77 worked fine on GB. No issues for me.

popthosegaskets said:
Did you flash the correct baseband for the ROM? Each Android version works with a different baseband.
僕のLT18iから送られてきた
Click to expand...
Click to collapse
I used what comes in the .FTF itself. I even tried flashing with Sony's official flash tool for unlocked bootloaders. I'll try manually flashing basebands and switch them out to see whether that works.
Someguyfromhell said:
Never had problems with using various basebands on various ROMs. 64 worked fine on ICS, 77 worked fine on GB. No issues for me.
Click to expand...
Click to collapse
Gotta check then.

Had you checked in what mode are you?
2G, 2G/3G Prefered, 3G only
Had you configured the APN Settings? In my phone it doesnt donwload anything from 3G/2G until i register the network.
Or perhaps you didnt do all the wipes and some remanent file is causing the problem.

17th_angel said:
Had you checked in what mode are you?
2G, 2G/3G Prefered, 3G only
Had you configured the APN Settings? In my phone it doesnt donwload anything from 3G/2G until i register the network.
Or perhaps you didnt do all the wipes and some remanent file is causing the problem.
Click to expand...
Click to collapse
Residual files seems to be the problem. I have the correct APNs and correct mode. I should try clearing with fastboot.

GMattZ said:
Residual files seems to be the problem. I have the correct APNs and correct mode. I should try clearing with fastboot.
Click to expand...
Click to collapse
Flash a new kernel and do clean install, wipe everything and flash a ROM.
僕のLT18iから送られてきた

Wiping everything off and flashing a new kernel and again wiping and going back to stock ROM worked.
Thanks for all your support guys!

GMattZ said:
Wiping everything off and flashing a new kernel and again wiping and going back to stock ROM worked.
Thanks for all your support guys!
Click to expand...
Click to collapse
hi ... ihave the same problem .. can u please tell me what have you done exactly ?

[Q] LG Optimus G No network (Help please)

I had the CM11 rom...flashed the Vanir rom and since have not been able to get any network. I made a backup before and reverted to that backup but now theres no network even in CM11...I am using the LG F180S...Help please :\

neaznc021 said:
I had the CM11 rom...flashed the Vanir rom and since have not been able to get any network. I made a backup before and reverted to that backup but now theres no network even in CM11...I am using the LG F180S...Help please :\
Click to expand...
Click to collapse
I had similar problem.
I'm on E975 and I was able to get networks connecting manually because LTE is on by default (but it was always droping)
After changing to 3G no more problems. Have you tried this?
P.S. I never tried to solve the 4G issue but probably I need to change APN settings.

rimsilva said:
I had similar problem.
I'm on E975 and I was able to get networks connecting manually because LTE is on by default (but it was always droping)
After changing to 3G no more problems. Have you tried this?
P.S. I never tried to solve the 4G issue but probably I need to change APN settings.
Click to expand...
Click to collapse
Mine doesn't even recognize the network. Can't even search for it manually. I reflashed the KDZ and flashed the baseband still no network :\

Don't understand what you mean... after reboot you get any message? What do you have in status bar? the red cross over the signal icon?
That what I was getting...
You can't go to setting - more - mobile networks - network operators and seach networks? Why, it's grey?

rimsilva said:
Don't understand what you mean... after reboot you get any message? What do you have in status bar? the red cross over the signal icon?
That what I was getting...
You can't go to setting - more - mobile networks - network operators and seach networks? Why, it's grey?
Click to expand...
Click to collapse
Yeah I;m getting the red cross. When I was in CM 11, I tried searching for networks manually but it would just be a loop. So I reflashed the LGF180S KDZ and I am back to stock. Still I have the red cross and the stock rom does not allow to search for networks manually.

neaznc021 said:
Yeah I;m getting the red cross. When I was in CM 11, I tried searching for networks manually but it would just be a loop. So I reflashed the LGF180S KDZ and I am back to stock. Still I have the red cross and the stock rom does not allow to search for networks manually.
Click to expand...
Click to collapse
I'm with E975 stock ROM and I have the options to search network, as I mention above and you should have too.
The problem here could be that it's grey and you are not allowed to do it, but the option is there, is that your case?
I'm not sure if I had that before (you know so many flashes...) but I've always solved my issues by restoring to a previous works ROM. I remember that I got GPS issues too and I restore a ROM backup.
I believe that I can't help more

flash baseband and you're done

and8eye said:
flash baseband and you're done
Click to expand...
Click to collapse
tried and didn't work...Had to flash e975 kdz and flash f180s modem through CWM

me also have the samr problem.where to het naseband?
Sent from my LG-E975 using xda app-developers app

This post may help yu... Use it as reference
http://forum.xda-developers.com/showthread.php?p=47101752
Sent from my LG-E975 powering Stock 4.1.2

first if you read a little and ask in the Vanir rom thread if you can't see which of the 2 roms are for your phone, you need to have the correct modem flashed to the rom aswell, plus using the right APN's or else you can have network trouble.
i am running stock CM11 on my own E975 and it don't have any mobile network when i do a reboot or a cold boot, but then i go in and search for network and all networks in my country shows up, and i just choose the one i want and i get 3g/4g LTE no problem there

"LTE !"

Hey all, hope you are having a good weekend.
the problem that I am having is that my phone is showing that it's detecting LTE data, but nothing will load with it because most of the time the icon indicates "LTE !" This problem started about a week ago and I'm unsure if this is a carrier data network issue or something to do with my phone. I am running cm13 and here are a few of the things I have tried:
-factory reset data
-restore to backup of a time when my phone worked properly
-advanced wipe data, system, cache, etc. everything except internal and external storage
-do the previous but install the latest version of cm available with gapps
none of these attempts successful. anyone dealt with this before? any input appreciated

dpowers2 said:
Hey all, hope you are having a good weekend.
the problem that I am having is that my phone is showing that it's detecting LTE data, but nothing will load with it because most of the time the icon indicates "LTE !" This problem started about a week ago and I'm unsure if this is a carrier data network issue or something to do with my phone. I am running cm13 and here are a few of the things I have tried:
-factory reset data
-restore to two backup of a time when my phone worked properly
-advance wipe data, system, cache, etc. everything except internal and external storage
-do the previous but install the latest version of cm available with gapps
none of these attempts successful. anyone dealt with this before? any input appreciated
Click to expand...
Click to collapse
also forgot to mention that I checked the APN data settings and made sure those were all correct

dpowers2 said:
also forgot to mention that I checked the APN data settings and made sure those were all correct
Click to expand...
Click to collapse
There is an option somewhere in settings to enable only LTE or 4g. Did you set it to 4g/LTE only to see what happens ?

Dnfmind said:
There is an option somewhere in settings to enable only LTE or 4g. Did you set it to 4g/LTE only to see what happens ?
Click to expand...
Click to collapse
Yeah it was already set to Lte only. I also tried switching it to 3g and then back to Lte only to see if that would make a difference. another thing i tried was taking out the sim card and re inserting it

dpowers2 said:
Yeah it was already set to Lte only. I also tried switching it to 3g and then back to Lte only to see if that would make a difference. another thing i tried was taking out the sim card and re inserting it
Click to expand...
Click to collapse
Okay so if it's not the network ...then it could be the modem image itself. Did you come from stock or an another custom ROM to cm 13 ?.
---------- Post added at 05:25 AM ---------- Previous post was at 05:25 AM ----------
dpowers2 said:
Yeah it was already set to Lte only. I also tried switching it to 3g and then back to Lte only to see if that would make a difference. another thing i tried was taking out the sim card and re inserting it
Click to expand...
Click to collapse
I'd also check cm known issues

I came from the stock Asus rom. didn't see anything on the known issues page

anyone else have any idea? I'm still dealing with this issue as

Fix
dpowers2 said:
anyone else have any idea? I'm still dealing with this issue as
Click to expand...
Click to collapse
Just turn on and of AirPlane Mode. Then it'll work fine. Just a DNS bug or something. Not really a bug deal.
*(T-Mobile Houston area)