[Q] No service after custom rom installed - T-Mobile, Samsung Galaxy SIII

I previously had a Resurrection mod that was using jellybean. The new custom mod i installed is Cynaogenmod 12.1 lolipop.
After i installed the new custom rom i got a "Root Access Possibly Lost. fix" error message straight from CWM recovery mode. After the first long boot of the new custom mod i had no cell service. Also, i tried restarting into CWM but i think it is now lost because of that error message.
Anyways, i looked at the back of my phone and the IMEI number matches the number in the About Phone. Another thing of note is that there is no APN. I tried putting in the APN settings but it wouldnt save. It says: "Acess Point Name settings are not available for this user.
I'm new to rooting so, im not even sure how to root the phone again. Should that be my first step? WIll it be different because it has lolipop installed?
My phone:
SGH-T999
android version: 5.1.1
UPDATE Ok, it says "No Service" but i can make phone calls and send text messages. However, my DATA service isnt working, when i turn off WIFI i cant use the internet. Thats the problem.

Is the phone running the latest bootloader and modem?

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[Q] [HELP] Stucked in weird issue

Just got Samsung Nexus Korean maguro variant yakju with 4.1 installed and with Baseband: UGKL1 and my network is Warid Tel - Pakistan. I used my local sim in as well and it was working fine. Today I tried to use custom 4.3.1 in it and so I done these steps:
Downloaded Nexus Root Toolkit, Android SDK, Latest Nexus drivers and all pre-requisites before starting. Now I first started to unlock my Bootloader with matching requirements as the tool already do this. Then flashed cwm touch recovery and applied root. I tool backup of my stock rom via cwm and then wipe all and installed liquidsmooth 2.7 which is jb 4.3.1 and it worked like a charm. What i noticed afterwards that the rom is reading my carrier details correctly but also showing Emergency call only warning as well. I tried Edge as well and it was wokring normally but when i tried to dial a call and tried to send txt it showed me Mobile network not avaialable. Then I tried all latest radio basebands on it, tried all settings SMSC and normal troubleshoots but couldn't get complete carrier support. Then I restored my default stock rom via cmw and boom no issues like it should be. Now my question is did I missed something for it? or am I flashing wrong basebands? or somthing else? After too many hours i felt that I cannot go further from here. I am attaching my screenshots. Please if anyone can tell me or guide me I will be very thankful to him as I haven't tried my phone yet, just got it. I had HTC evo 3d and its setup of everything never got me stucked like this.
Anybody up for help kindly
Sent from my Galaxy Nexus ...

[Q] How to enable network data after installing Cyanogenmod CM11 M7?

I tried flashing a custom ROM for the first time last night and so far I am really loving it. The only problem is, after flashing the CM11 M7 ROM it wont access any data over the cell network. I did figure out that if using Titanium Backup I restore my stock ROMs 4.3 data only from the Phone/Messaging Storage (SMS/MMS/APN) then reboot the network data does work. However, this causes the SMS to cease functioning. As soon as any app (default messenger, hangouts, 2-3 others I tried from store) tries to open it immediately crashes. Interestingly, it also will not allow me to restore my SMS records using Super Backup at this point. If I go back into Titanium backup then wipe the data for this process then the SMS starts working again, but all the old messages have been cleared, and as soon as I restart the phone the Network data is not working again.
Any ideas on what to do? I am wondering if maybe I need to adjust something in my APN profile, though I have absolutely no idea where I would get the information to do this.
This is what I am working with:
Phone: Samsung Galaxy S3 i747 (AT&T) -- [though currently I am using a TIGO sim card in Guatemala, wonder if this could have anything to do with it? was not a problem prior to switching the ROM though]
ROM: cm-11-20140608-SNAPSHOT-M7-d2lte.zip , the Cyanogenmod CM11 Snapshot lte release from yesterday
Android Version: 4.4.2
Baseband Version: I747UCUEMJB
Kernel Version: 3.4.91-cyanogenmod-g9b9605b8 [email protected] #1
Anyways, only having one or the other of my network data vs sms working is not really an option for me, so need to figure something out.
Thanks!
bnook said:
I tried flashing a custom ROM for the first time last night and so far I am really loving it. The only problem is, after flashing the CM11 M7 ROM it wont access any data over the cell network. I did figure out that if using Titanium Backup I restore my stock ROMs 4.3 data only from the Phone/Messaging Storage (SMS/MMS/APN) then reboot the network data does work. However, this causes the SMS to cease functioning. As soon as any app (default messenger, hangouts, 2-3 others I tried from store) tries to open it immediately crashes. Interestingly, it also will not allow me to restore my SMS records using Super Backup at this point. If I go back into Titanium backup then wipe the data for this process then the SMS starts working again, but all the old messages have been cleared, and as soon as I restart the phone the Network data is not working again.
Any ideas on what to do? I am wondering if maybe I need to adjust something in my APN profile, though I have absolutely no idea where I would get the information to do this.
This is what I am working with:
Phone: Samsung Galaxy S3 i747 (AT&T) -- [though currently I am using a TIGO sim card in Guatemala, wonder if this could have anything to do with it? was not a problem prior to switching the ROM though]
ROM: cm-11-20140608-SNAPSHOT-M7-d2lte.zip , the Cyanogenmod CM11 Snapshot lte release from yesterday
Android Version: 4.4.2
Baseband Version: I747UCUEMJB
Kernel Version: 3.4.91-cyanogenmod-g9b9605b8 [email protected] #1
Anyways, only having one or the other of my network data vs sms working is not really an option for me, so need to figure something out.
Thanks!
Click to expand...
Click to collapse
I apologize in advanced for not answering your question.
Is your issue that you cannot even get a signal with CM installed? I am also having the same issue.
Did your phone get signal/mobile network with the stock ROM? I am unable to find out if mine will work right now because it would take me a few days to download the stock ROM image...
Will be following this thread...
Mike
Have you checked that the APN on your phone is the right one for your carrier? Google search apn tigo guatemala galaxy s3 Many useful results will come up.
Ok here is how this played out. I did just need to reset then re enter the apn info for tigo in Guatemala. I actually managed to pull this info out of my pre flash backup from when I was using the stock Rom, then wipe the data for the process mentioned. This restored sms functionality and I then was able to manually enter the apn info (if anyone needs the Guatemala tigo apn info just post here and I can grab it when I am next at my cpu). I find it interesting that the apn info was automatically present and correct when I was using the stock Rom, but when I flashed cm11 over it was not there.
Just arrived back in the US and popped in my AT&T SIM card, everything worked fine right off the bat with it.
In answer to your question, after flashing cm11 I did have signal, but only for calls and sms. The data component of the network was not recognized.
Sent from my SAMSUNG-SGH-I747 using Tapatalk

[Q] No Signal (Practically)

I just modded my phone (unlocked, custom recovery, s-off, super cid) but now that I have a custom rom I have no service. Well it says I have a couple bars but its basically just the basics I can call and text but no internet. I tried flashing the tmobile radio but that didnt fix it. I was using paranoid android but I noticed the problem so I tried a different rom but Im still having the same problem. Does anyone know a fix for this?
Also in my settings it says "Mobile network state: Disconnected"
Check your Apn settings ?

[Q] I installed a new ROM, now I have no cell service.

So the warranty on my SGH-I747m just expired, so today I decided to install a custom ROM. I installed CWM, made a backup, then flashed the latest d2lte nightly of CarbonRom. Now I have no cell service, and my APN menu is blank. If I try to enter in my APN settings manually and tap 'save', it doesn't save - the list remains blank. I tried downloading Tweakker's APN app, and it says I have no SIM card!
I know my SIM card works perfectly fine, because I was making calls and texts and had internet just hours before I decided to install this ROM. So what the heck is going on here?! This would be the third Android device I have installed a custom ROM onto, all on the same carrier, and none have given me this trouble before.
Is your bootloader and modem up to date?
audit13 said:
Is your modem up to date?
Click to expand...
Click to collapse
No, lol. I updated the modem, that ended up fixing it, thanks

Unknown Baseband after flashing rom

Okay so i have the T-Mobile Galaxy s3. It has been rooted for a while with zero problems. I got tired of the older android on it and decided to install a rom. I installed Cyanogenmod 13.0-20151208-unofficial-d2tmo running android 6.0.1. When i first got it all booted and loaded with gapps, i noticed that it recognized my sim and that i had a signal but i couldn't use any LTE or just all around data. basically i couldn't go online (in case i just didn't explain that well enough. Phone service is a mystery to me). I did some searching online and found a lot of people saying that i needed to update my baseband. i found a baseband for my model (T999) and tried to flash it in TWRM. Once i rebooted, it said "No SIM card - No service." in the upper left-hand side. i have tried flashing multiple different basebands the same way with no luck. i tried backing up my EFS folder and the restoring it because someone said to do that and that just... just no... it didn't do anything. even Odin 3 said it was a "FAIL!". So here i am with this android equivalent to an Ipod and i hate this. Everything else in this ROM works perfectly aside from this but this is a super big problem. PLEASE HELP!!!! A phone isn't a phone if you cant even send a text.
Did you update the phone's bootloader and modem to the latest version before flashing CM?

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