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Discuss iphone 3gs model no MC131B at the iPhone 3GS - Hackint0sh.org; Is there a way to permanently unlock a iphone 3gs model MC131B...
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    Default iphone 3gs model no MC131B

    Is there a way to permanently unlock a iphone 3gs model MC131B



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    Based on the model number, this is locked to O2. Your only chance for a permanent carrier unlock that is not ultrasn0w based (ultrasn0w is not permanent, it doesn't stay during upgrades, and it's software based) would be to contact O2 and see if they will unlock the phone for you if it is already out of contract, or for a fee.

    If you're interested in a software based unlock, we'll need to know what iOS revision you're running and what baseband you have.
    The preceding forum post has been brought to you by the letter "N" and the number 42.

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    Quote Originally Posted by n1ckn4m3 View Post
    Based on the model number, this is locked to O2. Your only chance for a permanent carrier unlock that is not ultrasn0w based (ultrasn0w is not permanent, it doesn't stay during upgrades, and it's software based) would be to contact O2 and see if they will unlock the phone for you if it is already out of contract, or for a fee.

    If you're interested in a software based unlock, we'll need to know what iOS revision you're running and what baseband you have.
    I don't know about the carrier and its contract bcoz i bought it used can i find the info about carrier and contract.


    Its version was 4.3.3 when i bought and now i have downgraded it to 4.1 and baseband is 06.15.00 and its software unlocked with ultrasnow.

    and one thing else i would like to know is the baseband down gradable

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    Super Moderator Array n1ckn4m3's Avatar

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    A) I told you the carrier, based on the model number the phone was a factory locked O2 phone from the UK, so, now you know!
    B) The 06.15 baseband is ONLY able to be downgraded on the very first 3GS models that were released, with the 05.08 bootloader. I can almost guarantee (unfortunately) that yours is not this bootloader, as they comprise less than 5-10% of the surviving 3GS population.
    The preceding forum post has been brought to you by the letter "N" and the number 42.

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  5. Thanks terminator1983 thanked for this post.
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    Quote Originally Posted by n1ckn4m3 View Post
    A) I told you the carrier, based on the model number the phone was a factory locked O2 phone from the UK, so, now you know!
    B) The 06.15 baseband is ONLY able to be downgraded on the very first 3GS models that were released, with the 05.08 bootloader. I can almost guarantee (unfortunately) that yours is not this bootloader, as they comprise less than 5-10% of the surviving 3GS population.

    ok thanks can i check the phones manufacture date from its serial number bcoz on site it was written that the phone manufacture date is given in the starting numbers of serial


    my phone starting numbers of serial number 5k1131


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    Do NOT use the serial number to determine bootrom, this is very unreliable and can end up in you clicking a button that bricks your phone. There are only a few ways to properly test whether or not you have the new bootrom:

    How to Check iPhone 3GS New Bootrom / Old Bootrom (iBoot) Version | Redmond Pie

    That said, going by the S/N, you are NOT an old bootrom device. They did not make iPhone 3GS in the 13th week of the year they were released, so based solely on the S/N, you have a new bootrom, but you can check to make 100% sure by following the instructions above.
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    I guess you're making a mistake: only a few 3G can downgrade the baseband (fuzzyband) not 3GS

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    Quote Originally Posted by baro View Post
    I guess you're making a mistake: only a few 3G can downgrade the baseband (fuzzyband) not 3GS
    OK but just for general information is it right that the manufacturing year of iphone can judged from its serial number.

    as mine is 5k1131 so can i say that the manufacturing date of my iphone is 13th week of 2011

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    Quote Originally Posted by baro View Post
    I guess you're making a mistake: only a few 3G can downgrade the baseband (fuzzyband) not 3GS
    You're 100% correct. I was confusing the 3G's old bootrom ability to downgrade baseband to the 3GS's old bootrom's low level exploit that allowed permanent pwnage. As baro mentions, the old bootrom 3GS cannot downgrade baseband -- but the old bootrom 3GS can be untethered on iOS 5.
    The preceding forum post has been brought to you by the letter "N" and the number 42.

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    Restore problems? Read this: http://www.hackint0sh.org/f137/130802.htm

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