[Q] Unlock Galaxy S3 GT-I9300 4.3

337Manni said:

Hi all.

I have the Samsung Galaxy S3 currently locked on the T-Mobile UK (Now EE) Network.
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Model Number : GT-I9300
Android Version : 4.3
Baseband Version : I9300BVUGNB2
Kernal Version : 3.0.31-2372379 dpi@DELL145 # 1 Mon Feb 17 22:21:57 KST 2014
Build Number : JSS15J.I9300XXUGNB5
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I'm looking to unlock the sim so I can use a different carrier.

This is what I've tried so far....

I have sucessfully Rooted my phone

I have SuperSU, CWM Rom Manager, CWM Recovery, BusyBox Free.

I have tried GalaxSim Unlock and it identifies my IMEI Number and reports that Network Lock, Subset Network Lock, SP Lock, CP Lock & Data Lock are all unlocked & States that "Your Device Is Unlocked", however I'm still locked to T-Mobile.

After reading here on xda I believe this is because of the EFS v2 ???

Is there any way to SIM unlock this at the moment without going through T-Mobile?
Is there another way round this?
Can I down grade EFS? (I don't have any backups)
Happy to use a custom ROM or what ever is needed in order to do this.

Thanks for your help

Kind Regards,

Lee

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Tkkg1994 said:

I unlocked my device in these steps:
1. Download a firmware version from Sammobile of your country
2. Search a version from your country with no Branding
3. Dowload it and Odini
4. Flash through Download Mode

Worked for me..

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tallman43 said:

Mmm.. If it was that easy everybody would be doing it perhaps you where not fully sim locked also as far as I know 4.3 can't be unlocked even Galaxy sim unlock dev say's if you are on efsv2 that it is not possible to unlock at the moment without code.

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wetfoot said:

So for unlocking where is a reputable place to get a code? (can I just take it to a market stall?)

I have a i9300 locked to UK Orange and I need to get it unlocked.

Responses from seasoned forum members especially appreciated!

Info:

Android version 4.3

Baseband: I9300BVUGNB2

Kernel Version: 3.0.31-2372379
dpi@DELL145#1
Mon Feb 17 22:21:57 KST 2014

Build Number: JSS15J.19300XXUGNB5

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337Manni said:

Thanks for your reply.

Whats the best way to backup my EFS? Have you a link to a how too?

If I purchase the unlock code from T-Mobile / EE and use it to unlock my carrier if I then decide to go and install a custom ROM / mess with my phone, would this affect the sim unlock? I just want to make sure that once it's unlocked thats it, forever...

Thanks again!

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