How does this work ??

Discussion in 'iPhone' started by yv.haranath, Mar 27, 2010.

  1. yv.haranath macrumors member

    Jul 13, 2009
    Recently i bought iphone 3gs from craigslist, it has os 3.1.3 and base band 5.12.01.

    I searched and found their is no unlock for the baseband 5.12.01 for iphone 3gs.

    But when i put my old ATT sim card (which doesnot have data plan) , it works...

    why is that ?

    Can it even work for T mobile ?
  2. r.j.s Moderator emeritus


    Mar 7, 2007
    It works for AT&T because it is locked to AT&T. :confused:
  3. fireshot91 macrumors 601


    Jul 31, 2008
    Northern VA
    AT&T activated SIM cards will work.

    Even if it doesn't have a data plan (But isn't blocked), it'll work, and everytime it uses data, it will add up and charge you (Which is very expensive).

    Might as well get a data plan..
  4. yv.haranath thread starter macrumors member

    Jul 13, 2009
    i got works even i dont have data plan.....umm...weird..

    but if u you put any sim in iphone 3gs with 3.1.2 will not work unless u register with ATT for data plan ??

    And if i jailbreak and unlock right then i wont be able to use data plan and wont get charged right ??

    thanks all....
  5. Applejuiced macrumors Westmere


    Apr 16, 2008
    At the iPhone hacks section.
    Once the iphone its activated with an official AT&T sim it will work no matter what ATT simcard you stick in.

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