I haven't been able to find an answer to my exact problem, so forgive me for presenting another upgrade swap scenario/question: I already have an iPhone (3G). I am perfectly happy with this phone. My husband wants an iPhone but won't be eligible until Jan. 2012 - yeesh. He currently has a really cruddy phone that I have no interest in using. Can I upgrade to the iPhone 4, swap phones with him, and then swap back so that I still have my original phone? All of the scenarios I see have the swapper using the other person's phone. If this is possible, will my grandfathered data plan still be available, or will I have to get the $15 plan? Sorry if this is, in fact, a double (quadruple-million?) post, I just trust customers more than staff and wanted an answer.