Sort of, and maybe.
Your old SIM has most likely been deactivated. You may be able to recover your contacts from it, but it won't make or receive calls.
It's possible to use SOME postpaid phones on prepaid service, but the iPhones and some BlackBerry phones don't play nice. Basically, you buy a cheap GoPhone, activate it, and then.. well, I forget. I'm more familiar with using a GoPhone SIM in a regular AT&T phone (SIM has to be unlocked by customer care, but you get a one-time shot of 150 bonus minutes).
But I digress. I'd recommend calling prepaid customer care to inquire about this before buying anything.
02-23-10 12:03 PM