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how to unlock galaxy s4 AT&T

56 posts
Thanks Meter: 3
 
By elaraj, Member on 23rd April 2014, 12:52 PM
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hi

I have Samsung galaxy s4 AT&T running in 4.4.2 software how can I unlock it ? there's anyway to unlock it for free ?
 
 
23rd April 2014, 05:20 PM |#2  
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Follow method 2 from http://forum.xda-developers.com/show....php?t=2595457

Sent from my SAMSUNG-SGH-I337 using Tapatalk
24th April 2014, 08:05 AM |#3  
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Quote:
Originally Posted by jmjoyas

Follow method 2 from http://forum.xda-developers.com/show....php?t=2595457

Sent from my SAMSUNG-SGH-I337 using Tapatalk

thank you
24th April 2014, 09:10 AM |#4  
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Quote:
Originally Posted by jmjoyas

Follow method 2 from http://forum.xda-developers.com/show....php?t=2595457

Sent from my SAMSUNG-SGH-I337 using Tapatalk

thank you again I did all steps and still saying invalid sim
24th April 2014, 10:32 AM |#5  
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Quote:
Originally Posted by jmjoyas

Follow method 2 from http://forum.xda-developers.com/show....php?t=2595457

Sent from my SAMSUNG-SGH-I337 using Tapatalk

hi

after I tried method 2 and I couldn't unlock it I flashed MK2 modem back and now my phone tripping and keep freezing please I need help just to get my phone work normal

here's pic for my phone information now
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24th April 2014, 03:21 PM |#6  
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after I tried method 2 and I couldn't unlock it I flashed MK2 modem back and now my phone tripping and keep freezing please I need help just to get my phone work normal

here's pic for my phone information now[/QUOTE]

Greetings. I achieved my sgs4 unlock sgh-I337 in 4.4.2 but lowering the modem to mdl. but then again I had to flash the stock rom 4.4.2 to return the modem up. but I did going into safe mode with * # 0011 #

(1) *#0011# (found working on AT&T Galaxy S4)
(2)Now select [1] UMTS by tapping on it.
(3)When you get into the UMTS Main Menu, tap on [1] DEBUG SCREEN
(4)This will take you to Debug Screen menu where you have to select [6] PHONE CONTROL
(5)In the Phone Control menu, you will see an option called [6] NETWORK LOCK. Tap on it
(6)In the Network Lock screen, select [3] PERSO SHA256 OFF.
(7)On the next screen tap on SHA256_ENABLED_FLAG[1].
(8)Doing this will show the following message:

MENU NOT EXIST
PRESS BACK KEY
Current Command is 116631

(9)Now tap on the Menu button (left soft key on your phone) and select Back from the menu. (To go back, do not press the Back button of your device.) When you do this, you should see the following lines on the screen:

SHA256_ENABLED_FLAG[0]
SHA256_OFF => Not Change

(10)Ignore the above message and tap on the Menu button again and then select Back.
(11)Now you’ll see the Network Lock menu. Press the Menu button again and select Back. Repeat the Menu> Back action till you return back to the UMTS Main Menu.
(12)Here you will find an option called [6] COMMON. Tap on it.
(13)Next, select [6] NV REBUILD.
(14)In the NV Rebuild screen will look like as shown below.

Golden-Backup exist
You can Restore Cal/NV

(15)Tap on [4] Restore Back-up.
(16)Doing this will freeze your T-Mobile/AT&T Galaxy S4 temporarily. The screen will turn Off , followed by the Menu and Back buttons light up and device reboot.

this method worked lowering my modem to MDL, but then I had to flash the stock rom again to raise your version NB1 modem because I found not only the NB1 modem to flash it with odin. good luck and I hope you help
Last edited by ltindi32; 24th April 2014 at 04:10 PM.
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