hey guys, ive searched on the boards for a while now to find a complete answer to my question but haven't found the actual answer im looking for. I'm currently an AT&T subscriber and on the family plan with 3 other lines. I have the Cingular 3125 and pay $20 extra a month for the PDA plan. I'm getting an iPhone for christmas but I'm not up for a contract extension until May. When I get the iPhone is it possible for me to take out the sim card it comes with and put my 3G sim card I currently use into the iPhone and then register it and cancel my pda plan and add the iPhone data plan?