I have a iPhone 3G S with obviously a regular SIM. A couple members of our family plan bought iPhone 4s. They purchased using the eligibility of their lines on Apple.com. Well they are getting theirs next week (pre-ordered the night of the 15th and thus are getting theirs late). However, a member of our line has decided not to get the iPhone through their pre-order. Long story, but I was wondering if I could use the iPhone that they are having delivered, that they ordered through their line? Can I activate the micro sim that is included for use on my line, or is the microsim that came with her iPhone 4 already pre-configured to work only on her line? I know her eligibility will be lost, ect., but I was just wondering if the iPhone 4 and microsim can be used on any line, even though it was pre-ordered through her line. Thanks!