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If you’re one of the million people who’ve purchased an iPhone because the end associated with June, you most likely signed up with Apple’s exclusive company in the U.S., AT&T, whenever you activated your own phone. Which means your iPhone identifies itself to AT&T’s system using an AT&T SIM card, a smart card that’s situated in a small tray between your apple iphone’s sleep/wake button and it is recessed headphone jack port.