Okay, I have a problem. The line I plan on porting (line A) from Verizon Wireless is currently the primary line on a family plan. I am unable to get that changed until tomorrow morning. If I am not able to make it a secondary number before I get my iPhone 4, will this hypothetical situtation work? Say I get an iPhone 4 with a new line of service and new number (line B), will I be able to use both lines, and then at a later date port the Verizon number (line A) to the iPhone 4 and get rid of line B's new phone number? Hopefully that made sense, and thanks for any help!