if i have a random phone and borrow a friends iphone, put in the 3g simcard i already have in my little nokia, sync it up to my iMac and activate a plan, does this mess up my friends service when he replaces his sim card back in to his iphone. if this works people could simply borrow and iphone, sign up. take their card out and go to att on the 11th and no problemo.......i PRAY this is the fact...so who is gonna try it out? the whole idea being that i'd then be a current iphone user prior to july 11 which would make the cost 199/299. it should work i know but will it?