Here's what I'm looking to do. 1. Ditch the evil empire known as Verizon. I've had it with them. 2. Purchase an unlocked GSM based phone. 3. Walk into an ATT store, purchase a SIM Card. 4. Activate the phone I bought elsewhere and use the sim card to a new PREPAID line of service by porting my VZW phone number onto ATT. While I would expect this to all be very easy, is it possible? The other question is--can I buy a prepaid goPhone from any retailer, activate that, and then switch any compatible device onto the plan? Thanks in advance.