Database Users

[Q] Sim Unlock AT&T S4 MF3 build OPTIONS?

I have done lots of reading on this and I am still not sure if the solution really exist ...
AT&T Sansung Galaxy S4 i337 MF3 build
1. Having MF3 build, none of the easy unlock solution worked.
2. Can I go back to any previous stock ROM from MF3 such that any of the easy unlock process would work?
3. Will the rooting methods using this be able to sim unlock my device?
4. I assume not, but will updating my MF3 build to any recent ones (MJ6 or MJ9) solve my problem?
Ultimately I want to unlock my device without having to pay $20- $30.
Any help will be appreciated.
Thanks

touchworks said:
I have done lots of reading on this and I am still not sure if the solution really exist ...
AT&T Sansung Galaxy S4 i337 MF3 build
1. Having MF3 build, none of the easy unlock solution worked.
2. Can I go back to any previous stock ROM from MF3 such that any of the easy unlock process would work?
3. Will the rooting methods using this be able to sim unlock my device?
4. I assume not, but will updating my MF3 build to any recent ones (MJ6 or MJ9) solve my problem?
Ultimately I want to unlock my device without having to pay $20- $30.
Any help will be appreciated.
Thanks
Click to expand...
Click to collapse
Lucky you, I just SIM unlocked my friends Galaxy S4 i337 MF3 from AT&T last night so I can tell you your options.
If your phone is off contract (fully paid) you can call AT&T and ask them for an unlock code.
Pay $10-$30 for a factory unlock code for your device from Ebay or whatever.
Root your device, block the AT&T updater from updating you to 4.3, and get the app Region Lock Away from the Play Store.
AT&T denied us the unlock code so we went with the Region Lock Away app from the Play Store and today my friend just activated his AT&T S4 with a T-Mobile prepaid plan. They transferred his number within a couple hours (4 hours or so) and he's been playing with 4G LTE, texting and calling all morning. He hasn't had cell phone internet before because AT&T is so expensive so he is pretty happy.

ximaginex said:
Lucky you, I just SIM unlocked my friends Galaxy S4 i337 MF3 from AT&T last night so I can tell you your options.
If your phone is off contract (fully paid) you can call AT&T and ask them for an unlock code.
Pay $10-$30 for a factory unlock code for your device from Ebay or whatever.
Root your device, block the AT&T updater from updating you to 4.3, and get the app Region Lock Away from the Play Store.
AT&T denied us the unlock code so we went with the Region Lock Away app from the Play Store and today my friend just activated his AT&T S4 with a T-Mobile prepaid plan. They transferred his number within a couple hours (4 hours or so) and he's been playing with 4G LTE, texting and calling all morning. He hasn't had cell phone internet before because AT&T is so expensive so he is pretty happy.
Click to expand...
Click to collapse
I did it and it works. My phone is unlocked now. Is it safe to update to 4.3 now ?

touchworks said:
I did it and it works. My phone is unlocked now. Is it safe to update to 4.3 now ?
Click to expand...
Click to collapse
Probably not a good idea. The unlock is a software unlock so updating it might remove it and you might lose root capability as well. For now, wait and see if you can still root after the update. If you can, then you can update, root and reinstall the Region Lock Away.

Custom ROMs for SIM unlocked SPH-L720

Hi,
I have recently sim unlocked my SPH-L720 that means my Sprint Galaxy S4 is now working on T-Mobile sim. In order to do this I had to downgrade my baseband to MVC. Earlier I had NAE baseband. I think I read somewhere that I cannot upgrade my baseband version which will revert SIM unlock.
I want to install custom ROMs on my unlocked Sprint mobile now. Can someone please tell me how many custom ROMs can I install on my modified device? I am very much inclined towards installing Carbon Rom but not sure whether it will break away sim unlock feature. Here is the link to the post. http://forum.xda-developers.com/nexus-4/orig-development/rom-carbonrom-kitkat-t2630336
Please guide..

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

Updating an unlocked Samsung galaxy S4 to Lollipop

I have a AT&T Samsung Galaxy S4 (Unlocked) and I am currently using it on Cricket wireless. The phone is currently running on Android 4.4.3 and I would like to update the same to Lollipop. Samsung Galaxy S4 got Lollipop rolled out by AT&T recently but I was not able to get the same since I switched carriers.
Now what is the best way to update the phone. If possible I don't want to root the phone. I went to best buy local store but they were not able to do the same as they said the phone is unlocked. Please let me know how I can update my phone to the latest version. It will be really helpful if someone can point me in the right direction.
Thanks all in advance for the help.

Will putting a AT&T sim in my phone help with the OTA? In the sense if I get an AT&T sim card from someone or purchase one and put it in to my phone will that help with the OTA? I am not sure if this phone was unlocked by AT&T.

I was able to successfully install the updates on my phone. I was able to downgrade my phone by installing stock 4.4.2 using ODIN and then was able to upgrade my device to 4.4.4 first and then update to 5.0.1 via OTA. It was an easy process and the instructions in the ODIN thread was really helpful.

Similar situation
I too have an unlocked SGH-I337 that is unlocked from AT&T and I'm using it on T-Mobile. How did you perform the Lollipop update without an AT&T SIM? I took mine to the Samsung experience at Best Buy and they weren't able to do it via Kies and they believe it's because it's unlocked. Nothing else has been done to it, just the AT&T unlock so that I could switch carriers.
Thanks in advance,
Charlotte

Question about a new Galaxy S5 I received

Hello,
I recently had to trade in my old Galaxy S5 (Verizon) which was damaged beyond repair and received a newer upgraded model. I tried rooting it but was unable to get it to boot so I had to put it back on 5.0. After reading through some content I've learned that my phone may not be rootable, I'm hoping I'm wrong and there is a way to do it and any help would be greatly appreciated.
Model: SM-G900V
Android Version: 5.0
Baseband: G900VVRU2BOG5
Build: LRX21T.G900VVRU2BOG5
I've read that BOG5 cant be rooted, but stumbled across this:
http://forum.xda-developers.com/verizon-galaxy-s5/development/vzwstock-based-tw-rom-t3178953
Can anyone tell me what that is and if I can install it on my phone to allow root?
Thanks

BOG5 cannot be rooted. In order to flash that ROM you linked, you have to be rooted first. So you are stuck.

landshark68 said:
BOG5 cannot be rooted. In order to flash that ROM you linked, you have to be rooted first. So you are stuck.
Click to expand...
Click to collapse
Thanks for the reply. Damn Verizon.

pbeezy said:
Thanks for the reply. Damn Verizon.
Click to expand...
Click to collapse
Verizon and I believe AT&T has locked bootloaders, which prevents their smartphones from gaining root.
It's really a shame.
You're only solution is to try trading it online for another Galaxy S5.
For example, I have a Canadian Galaxy S5 Model: SM-G900W8, which doesn't have a locked bootloader, easy to unlock, so I can now use any (GSM) SIM card.
Check which US mobile carriers would would on an unlocked S5, then root away.
I know (an unlocked) Canadian S5 works on AT&T & T-Mobile for sure.
Verizon is like Wind Mobile ( using UMTS and HSPA+ 3G mobile networks )
Good luck.