Activating new 4s with a working foreign SIM?

Discussion in 'iPhone' started by boomasta, Oct 14, 2011.

  1. boomasta macrumors newbie

    Oct 6, 2011
    Hi Lads and Gents,

    this just dawned on me so please bear with me... i have searched the forum but could not find a definitive answer.

    I have an unopened iPhone 4S.. and I was wondering if i pull out the original ATT sim and put in my foreign (working) sim, what would happen? Would I not be able to activate? or perhaps worse, lock my phone to the foreign carrier?

    Any input is appreciated..:D
  2. miles01110 macrumors Core


    Jul 24, 2006
    The Ivory Tower (I'm not coming down)
    It wouldn't work. AT&T iPhones can only be used with AT&T SIM cards.

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