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Reader Request: Blackjack SIM in iPhone

A number of readers asked if I could try out an AT&T GSM SIM card in my iPhone. Fortunately, my sister is visiting town. After reassuring her ("You're going to do WHAT?"), she allowed me to pull out her SIM and test it in my iPhone. As expected, it was a no-go. I could not make any phone calls and I certainly was not going to let iTunes mess with her SIM card.