Searched threads and didn't find this specifically covered. Wife has been using a Moto v551 for more than 6 years. Her service started with Cingular which later became AT&T. They sent her a new SIM card 4 years ago and that's what is currently installed. She now is in possession of a used iPhone 3G. We're wondering about the best way to get her up and running: 1. Take the SIM from the v551 and put it in the 3G. Login to AT&T online and add the appropriate data plan ($15/mo 200MB) and make other relevant changes. Alternatively, call AT&T customer service and speak to a rep make the changes. Either way, enjoy not making a trip to the AT&T store. 2. Take both phones to the AT&T store. Ask them to install a brand new SIM into the 3G, and to make appropriate changes to her plan on the spot. Rest easy knowing that a fresh SIM is installed and everything is 'right' before leaving. Leave behind the v551 for recycling, too. Is there anything to be gained by having a fresh SIM installed? Will AT&T charge a "new SIM" fee? I recognize this question is a bit outdated considering the emphasis on iPhone 4, so I appreciate helpful replies all the more!