Im trying to upgrade my 1 year old account to a Iphone 3GS. I have 2 phones each with a its own # on 1 family plan. My phone (blackberry) is 1 year old and the other one (lg shine) is 2+ years old. Im able to upgrade online for a 3GS for 200$ on the Lg Shine phone. Is it possible to do that upgrade online and when the phone comes in the mail can I put the sim card from the blackberry into the Iphone? Would it work?