[Q] carrier unlocking jfltecan i337m on fido - AT&T Samsung Galaxy S 4 Q&A, Help & Troubleshootin

Hello, I can't seem to find the perfect answer in another thread.. I'm on a google experience 4.4.2 rom, with the MK6 modem and i'd really like to unlock my phone for use on a different carrier. i tried flashing an older modem but no luck.. is there a way i can do this myself without going into a shop and paying $40?

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[Q] GS4 for Cricket SIM unlock for international use

I have a galaxy S 4 for Cricket model SCH-R970C. I need to unlock the phone to able to use the SIM slot outside the U.S. I've been able to root the phone and I tried flashing a i9505 ROM thinking that would unlock the use of the SIM with no luck. The baseband modem firmware does not change when I flash a different ROM. There is little to no info out there about the cricket GS4. Is it possible to flash different modem firmware so that the phone can behave as an i9505 model? The hardware is the same... just can't change the modem firmware.
I need this ASAP otherwise I need to find a new phone! I'm not in the US now and calling Cricket is not an option. I tried flashing a different modem firmware using ODIN but it fails. What am I missing?
Any help would be appreciated. I'm willing to "donate" $$ for a solution. Thanks.
wallygator4life said:
I have a galaxy S 4 for Cricket model SCH-R970C. I need to unlock the phone to able to use the SIM slot outside the U.S. I've been able to root the phone and I tried flashing a i9505 ROM thinking that would unlock the use of the SIM with no luck. The baseband modem firmware does not change when I flash a different ROM. There is little to no info out there about the cricket GS4. Is it possible to flash different modem firmware so that the phone can behave as an i9505 model? The hardware is the same... just can't change the modem firmware.
I need this ASAP otherwise I need to find a new phone! I'm not in the US now and calling Cricket is not an option. I tried flashing a different modem firmware using ODIN but it fails. What am I missing?
Any help would be appreciated. I'm willing to "donate" $$ for a solution. Thanks.
Click to expand...
Click to collapse
Hi,
You should not flash a modem that is not meant for your phone.
You are risking a brick if you try it.
Your best bet may be to just buy an unlock code online.
Sent telepathically from my S4
wallygator4life said:
I have a galaxy S 4 for Cricket model SCH-R970C. I need to unlock the phone to able to use the SIM slot outside the U.S. I've been able to root the phone and I tried flashing a i9505 ROM thinking that would unlock the use of the SIM with no luck. The baseband modem firmware does not change when I flash a different ROM. There is little to no info out there about the cricket GS4. Is it possible to flash different modem firmware so that the phone can behave as an i9505 model? The hardware is the same... just can't change the modem firmware.
I need this ASAP otherwise I need to find a new phone! I'm not in the US now and calling Cricket is not an option. I tried flashing a different modem firmware using ODIN but it fails. What am I missing?
Any help would be appreciated. I'm willing to "donate" $$ for a solution. Thanks.
Click to expand...
Click to collapse
Any luck?
I tried the same thing i put t-mobile firmware on it. no luck. I was thinking of changing the baseband version . but im lost...
tonys2teg said:
Any luck?
I tried the same thing i put t-mobile firmware on it. no luck. I was thinking of changing the baseband version . but im lost...
Click to expand...
Click to collapse
No, i gave up on the phone. I don't think it's that easy to change the baseband firmware on the phone. I didn't try buying an unlock code, but that might be the only solution for now - just make sure the unlock code is specifically for the cricket model.
Has any managed unlock it? I need older modems in order to complete. The unlocking please provide me with them if you have.

How to use AT&T s4 on international network

Hi guys one of my friends bought a S4 in the US, It's AT&T locked SGH-I337 so can't use it with sim in our country (South Africa)We have two models of S4 here, the I9500&I9505. Was wondering what the right steps is to get the phone working? Must I root the phone and flash custom Rom & kernel or just unlock sim card? I'm not new to Rooting or flashing Roms but haven't fidled with carrier locked phones before. And is it possible to use custom Roms from At&t in other countries thanks in advance [emoji2]
Send from my UNBENDABLE NOTE 3 ?<br/>
Send from my UNBENDABLE NOTE 3 ?
Leonidas300 said:
Hi guys one of my friends bought a S4 in the US, It's AT&T locked SGH-I337 so can't use it with sim in our country (South Africa)We have two models of S4 here, the I9500&I9505. Was wondering what the right steps is to get the phone working? Must I root the phone and flash custom Rom & kernel or just unlock sim card? I'm not new to Rooting or flashing Roms but haven't fidled with carrier locked phones before. And is it possible to use custom Roms from At&t in other countries thanks in advance [emoji2]
Send from my UNBENDABLE NOTE 3 ?<br/>
Send from my UNBENDABLE NOTE 3 ?
Click to expand...
Click to collapse
The Sgh-i337 is basically the same as the gt-i9505 EXCEPT for ATT locking the bootloader on that model.
You CAN Sim unlock it so you can insert your Sim into it. You will have to reach it a bit though. It helps if you know what firmware is installed on the phone. If it is MDB, MDL, or MF3 it would be easier to do I believe. Either way look for the threads about unlocking.
If you have NEWER firmware then there are separate threads for it, and it will more than likely need to be rooted, flash a older modem, then perform the Sim unlock from the menu. If you cannot find the correct post I can help look for it later.
Just reply back with WHAT firmware and Baseband you have installed on the phone and we should be able to help you further.
If you do have MDB or MDL firmware do NOF update it...
RockRatt said:
The Sgh-i337 is basically the same as the gt-i9505 EXCEPT for ATT locking the bootloader on that model.
You CAN Sim unlock it so you can insert your Sim into it. You will have to reach it a bit though. It helps if you know what firmware is installed on the phone. If it is MDB, MDL, or MF3 it would be easier to do I believe. Either way look for the threads about unlocking.
If you have NEWER firmware then there are separate threads for it, and it will more than likely need to be rooted, flash a older modem, then perform the Sim unlock from the menu. If you cannot find the correct post I can help look for it later.
Just reply back with WHAT firmware and Baseband you have installed on the phone and we should be able to help you further.
If you do have MDB or MDL firmware do NOF update it...
Click to expand...
Click to collapse
Thanks for reply ,I have NC1 firmware and I used Method 3 on this guide http://forum.xda-developers.com/showthread.php?t=2595457 .SUCCESS!
Could you recommend a modem I could try other than MF3 as the signal isn't that great ?
Leonidas300 said:
Thanks for reply ,I have NC1 firmware and I used Method 3 on this guide http://forum.xda-developers.com/showthread.php?t=2595457 .SUCCESS!
Could you recommend a modem I could try other than MF3 as the signal isn't that great ?
Click to expand...
Click to collapse
Not sure which would work best for your area. You can download and try any/all of them until you find one that works best. You can switch back and forth with no issues without worries

Another unlock question

I have a Sprint S4 SPL-L720 rooted originally was L720VPUFNG2 modem. flashed Stock L720VPUAMDC I have tried several methods to unlock this phone for T-Mobile US sim with no luck .Has anyone got a proven unlock for my given situation. I'm not running CWM's or Cyonide Hope I can get something current to help me unlock this phone
Deleted

network unlock or modem swap i337m on 5.0.1

Hey people, I have an issue going on here.
I was going to unlock, but decided to reflash firmware and change the csc from rogers over to bell.
Kies recognizes the phone now as being a 'bell' phone, and have done an update just to confirm it but it still will not accept a bell sim. Every time I have inserted a bell sim it requests the 4 digit unlock code. The sim works just fine in my S3 and another bell S4, so that is not the problem.
All settings in the phone also show it to be 'bell', home screen and all, so the csc did take.
All the modems/firmware on sammobile are multi-csc, as i have tried to just flash the modem alone after I extracted it.
I could care less about being truly carrier free, as I am locked into a bell agreement through work.
Any suggestions on this, or do i have to purchase a code? I assume its locked now so I cannot downgrade to my understanding to a lower modem to use the service menu to unlock.
Thanks for the input.
I've flashed from a Bell 4.4.2 to Telus 5.01 without issue and the phone will remain sim-locked. The only difference I have seen between the Bell, Telus, and Rogers ROM are the carrier apps included with each ROM.
The sim unlock code is 8 digits long.
You should be able to downgrade the i337m's 5.01 stock ROM to a i337m 4.4.2 stock ROM. Then install the 4.2.2 modem, root the phone, run region unlock app, re-flash stock 5.01, and the phone will be sim unlocked. Doing this will trip the knox counter to 1 and void any remaining warranty.
I tried to downgrade, but it didnt take. I will try again. I know there was a discussion on booting the phone and not signing into google then reflash again. Is this needed?
Thanks for the reply.
Well, I got it to work this time. Much appreciated
You tried to flash a stock 4.4.2 rom from sammobile.com? Were there errors in Odin?

S4 i9507 Flashing + CSC

So my S6 had an unfortunate trip in the lake, and I'm going to resort to my sisters old S4 (I owned one too, but I totalled it).
Mine was rooted and had GPE loaded on it.
My old model was an i9505 and noticed that my sisters is a i9507 which is a strange variant (assuming its 4G+).
Anyway, when she had it, the phone constantly overheated and would constantly reboot. We returned for repair many times, each time showing no signs of issue.
What I would like to know is;
Would i9505 roms suit this phone? Or would I have to make do with stock.
And secondly, I am with telstra and the S4 is with virgin (OPS). Is it as simple as flashing a i9507 ROM from telsra on it, or do I have to do something else? This is for the CSC of course.
Is the phone sim unlocked? I recommend sim unlocking the phone before flashing any ROMs, especially custom ROMs as the unlock code needs to be entered using a stock Samsung dialler.
CSC doesn't really matter if the phone is sim unlocked.
Stock firmware is here: http://www.sammobile.com/firmwares/database/GT-I9507/
audit13 said:
Is the phone sim unlocked? I recommend sim unlocking the phone before flashing any ROMs, especially custom ROMs as the unlock code needs to be entered using a stock Samsung dialler.
CSC doesn't really matter if the phone is sim unlocked.
Stock firmware is here: http://www.sammobile.com/firmwares/database/GT-I9507/
Click to expand...
Click to collapse
Hmm stock firmware is only 5.0.1 and not for the carrier that I want. It's been so long since I've modded (since I've had stock S6 since I bought it). Can I change the CSC on that rom, or would it be locked to Optus.
Anyway I've put in my Telstra sim and it seems to work for the moment, picking up the telstra network and changing the APN's to telstras (maybe there is a CSC in the phone for TEL too?).
Just would like to know now if I'm able to use a GEL or AOSP rom for the i9505.
Thanks for the response.
The firmware should not matter. The CSC files are a customization of app for a particular carrier. There are 3 carriers in Canada (Rogers, Bell, Telus) for the s4 and I can cross-flash the firmware with no problems. I would be surprised if the phone can't work with Telstra if it is unlocked.
According to these specs, the 9507 uses a snapdragon 600 chip which is the chip used in the i337m and 9505: http://www.gsmarena.com/samsung_i9507_galaxy_s4_with_s600_spotted_in_glbench-news-6571.php

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