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AT&T Community Forums AT&T Community Forums I bought a.locked att iphone 5s from a guy who reset the phone said it was like new now. Now i have to activate it and i need a sim card for it and i was wondering if a prepaid att sim would worki. AT&T Community Forums AT&T Community Forums AT&T Community Forums AT&T Community Forums AT&T Community Forums AT&T Community Forums AT&T Community Forums.