I have gone to this store for different reasons, but it's generally been to get a new phone. Since I am now an iPhone user, this store is less relevant. I came to get a SIMM card to use in a modem for 3G internet access when away from home.
It seems like no one at AT*&T knows anything about prepaid wireless. That includes the store and the 800 support number.
The people that work here have always been helpful as they were today, but they can't give me advice about something for which they've never been trained.