So here's my situation. I have a line that's due for an upgrade on June 6th. I currently have a 3GS on another plan. I'd like to upgrade the older line, use the new iPhone on my new line and (eventually) cancel the first line. (I heard you have to keep the line for 30 days or you have to give the phone back) Here are a couple questions I have: When upgrading line #1, will I get hit with an activation fee for the new iPhone? Can I remove the data plan immediately so I'm not getting charged an extra $30 a month for the first month? I don't have a sim card for line #1 anymore. Will that be a problem? Is there any other problems I'm not thinking about that I might run into? Thanks for the help.