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This happened to my friend. She was charged for 2phones that she didnt even purchase.

Also it's possible for a sprint retention (not sure bout cust. serv.) to change your billing address so they can send anything you order over the phone to that new billing address and then change it back after. This leads me to believe it might be an inside job. Obviously another way is if someone knew your pin code when you call. How else can anyone know that information. If it were purchased online then that might be a different story.