Forgive me if this has been covered, but all the answers I can find are relating to AT&T and SIM cards. I have an iPhone4 on Verizon. My girlfriend has a contract that is up and purchased an Iphone4S and is planning on giving it to me, and me giving her my iPhone4. (She doesn't care about having the latest and greatest gadgets like me) Is this possible to do on Verizon? Do I need to take both phones in to verizon and have them swap plans or something? Or is it just a matter of associating the new phones to their respective accounts, which I believe is something we can take care of on our end. Thanks for any info!