iPhone Unlocking iPhone 4/4S for T-Mobile

Discussion in 'Jailbreaks and iOS Hacks' started by mohsy90, Jul 15, 2012.

  1. mohsy90, Jul 15, 2012
    Last edited: Jul 15, 2012

    mohsy90 macrumors 65816

    mohsy90

    Joined:
    Feb 4, 2011
    Location:
    New York
    #1
    Alright I'm trying to help a friend out whose looking to switch to t-mobile. I suggested he purchase a factory unlocked iPhone 4S instead of buying a jailbroken iPhone 4 that is unlocked using ultrasnow or a gevey sim.

    Well, I've been searching around and noticed individuals that are buying used at&t iPhone 4/4S and buying At&t sanctioned unlocks from websites or other forum members on marketplace forum. Can anyone enlighten me on exactly how this process works and any important notes I should know when buying a used iPhone 4/4S. I've been hearing that if you buy an iPhone 4/4S thats attached to an at&t contact the unlock won't work, is this true?

    Only reason I ask is that going through the at&t route seems to be considerably cheaper than purchasing a factory unlocked iPhone.
     
  2. dhlizard macrumors G4

    dhlizard

    Joined:
    Mar 16, 2009
    Location:
    The Jailbreak Community
    #2
    For iPhone4 unlocks, here are the options depending on baseband:
    Software unlock Ultrasn0w: bb 1.59.xx only
    Hardware unlock Gevey sim interposer: bb up to and including 4.10.xx
    IMEI unlock from carrier who sold the phone: all bbs

    For iPhone4S unlock, Gevey Ultra 4S for all basebands
    IMEI unlock from carrier who sold the phone: all bbs

    And the baseband cannot be changed or downgraded

    Next time, provide the basebands. Unlocks are baseband dependent !
     
  3. mohsy90 thread starter macrumors 65816

    mohsy90

    Joined:
    Feb 4, 2011
    Location:
    New York
    #3
    I understand the ultraslow and gevey sim unlocks, but how do the IMEI unlocks work. Can you buy any used at&t iPhone and purchase an unlock from a website or another member that has them available? I've heard that if someone sells an iPhone that is attached to a contract the unlock won't work. Can anyone confirm this.

    Also, is this only for iPhone 4S or does it work with iPhone 4.
     
  4. dhlizard macrumors G4

    dhlizard

    Joined:
    Mar 16, 2009
    Location:
    The Jailbreak Community
    #4
    IMEI unlocks are generally done by carrier who sold phone
     
  5. labman macrumors 604

    labman

    Joined:
    Jun 9, 2009
    Location:
    Mich near Detroit
    #5
    IMEI unlocks offered by anything other then the carriers are grey market and exactly that lots of people are happy but it's still a grey area market. you pay for the service and hope for the best.
     

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