Something I can't seem to figure out, is if upgrade using one line (ex. 555-555-5555) but I want to use the phone in another line (ex. 555-555-5556) How will I get the micro sim to use in the other phone? I have called 2 apple stores, one says- They can't do it. The other says, they can reflash the micro sim to a new number. Has anyone else, figured out anything about this?