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Sim card unlock Samsung Galaxy S3 GT-I9305

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By LucasBass, Senior Member on 11th March 2013, 02:28 PM
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Hi, I have a Samsung galaxy S3 GT-i9305 which is locked on EE, United Kingdom. Can someone help me to unlock it for free. I don't want to pay for something that can be done for free. I am on rooted stock Jelly bean 4.1.2. Another thing voodoo galaxy S3 Sim unlock and all free unlocking app on Google play doesn't work and also these instructions doesn't work cause the last option is not available.

Quote:

Put a different SIM to your own into the handset and then turn off the handset and switch it back on with that SIM inside.
Go to the dial pad on your phone and then type in *#197328640#.
Head over to the Main Menu of the device > [1] UMTS > [1] Debug Screen > [8] Phone Control > [6] Network Lock > Options [3]Perso SHA256 OFF > and wait for around 30 seconds.
You should then head to Menu and choose Back, where you will come across the Network Lock. Choose [4] NW Lock NV Data INITIALLIZ.
Enter *#197328640#.

Can someone help me please?


EDIT 12/27/2013 (Working for 4.3 and up too) See Feedback
Follow these instructions to unlock your phone. It worked for me.

First you need to downgrade to Jellybean 4.1.1.
Download the 4.1.1 firmware from the link below or find another one on sammobile
It is the stock 4.1.1 for S3 GT-i9305 (LTE) United kingdom (EE)

I got the firmware from http://sammobile.com/
http://terafile.co/e729d5704241/I930...VRALI5_EVR.zip

Boot into download mode, flash the downloaded firmware through ODIN.
Here is instructions on how to flash the firmware with Odin http://forum.xda-developers.com/show....php?t=1671969

Then use these instruction to unlock your phone.

Put a different SIM to your own into the handset and then turn off the handset and switch it back on with that SIM inside.
Go to the dial pad on your phone and then type in *#197328640#.
Head over to the Main Menu of the device > [1] UMTS > [1] Debug Screen > [8] Phone Control > [6] Network Lock > Options [3]Perso SHA256 OFF > and wait for around 30 seconds.
You should then head to Menu and choose Back, where you will come across the Network Lock. Choose [4] NW Lock NV Data INITIALLIZ.
Enter *#197328640#.

That's it your phone is now unlocked. You can use any sim card.
You can update, Root, flash custom and stock rom and everything you want. It will stay unlocked
This is the method I used to unlock my phone. I downgraded from 4.1.2 (the latest at that time) to 4.1.1.
Feedback is always appreciated. Do comment whether it worked or not for you. There's an amazing community here ready to help.
Last edited by LucasBass; 29th April 2015 at 04:26 PM.
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11th March 2013, 02:42 PM |#2  
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Re: unlocking samsung galaxy s3 gt-i9305
You need to downgrade JB to 4.1.1 if you want to use the Trick
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16th March 2013, 04:53 AM |#3  
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Quote:
Originally Posted by djembey

You need to downgrade JB to 4.1.1 if you want to use the Trick

How to downgrade to jellybean 4.1.1??
16th March 2013, 07:27 AM |#4  
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Re: unlocking samsung galaxy s3 gt-i9305
Use Odin and flash your phone with JB 4.1.1
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20th March 2013, 10:38 AM |#5  
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Can' I upgrade
Thanks, I have successfully downgraded to 4.1.1. and have also successfully unlocked my phone using the instructions above. Now I want to upgrade it, If i upgrade it will it lock my phone again?? If yes, Does someone have a solution to upgrade without locking my phone again?
Last edited by LucasBass; 27th December 2013 at 02:22 PM.
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20th March 2013, 11:25 AM |#6  
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Re: unlocking samsung galaxy s3 gt-i9305
No, it'll stay unlocked. You can upgrade to any rom, stock or custom. It's up to you I'm glad I could help.

Hit the Button and you're welcome
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20th March 2013, 11:20 PM |#7  
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Hi lucas, I'm in the same scenario. Can you tell me which rom you flashed/link to where you got it? So I can unlock mine too.

And if I want to upgrade back to the latest unbranded UK stock rom for the i9305 where would I find that?
21st March 2013, 01:26 AM |#8  
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Re: unlocking samsung galaxy s3 gt-i9305
www.sammobile.com/firmwares or www.samsung-updates.com
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21st March 2013, 10:51 AM |#9  
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Quote:
Originally Posted by djembey

www.sammobile.com/firmwares or www.samsung-updates.com

I can't find UNBRANDED United Kingdom firmware for the i9305 on either of those sites. They're all carrier branded. And the reason I want unbranded is to avoid any carrier bloatware etc.
Last edited by lite426; 21st March 2013 at 10:59 AM.
21st March 2013, 02:10 PM |#10  
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Re: unlocking samsung galaxy s3 gt-i9305
Just downgrade to any branded firmware, unlock, then head over to the xda developer forum to upgrade to the unbranded ROM of your choice
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