A:AnswerYou can just put your AT&T SIM card into the phone to "activate" it. In this modern age, "activation" basically means putting the SIM card into the phone, turning on the phone, and having the phone joining/running on the carrier network -- the phone should auto configure everything. You absolutely can switch to a different carrier and put in a different SIM card. Activation should not lock any unlocked phone into AT&T, or any carrier.
A:AnswerCheck the listing closely - it should say if it is under the manufacturer's warrenty plus whether BB will give you extended coverage. It usually depends on the condition (Refurbished, Excellent, Good or Fair). Refurbished and Excellent usually have a warranty, and it gets iffy with the lower quality items.
