I need help with this, I bought a 3gs from apple.com as an upgrade to the 2nd line on my account and sold it on ebay. They guy paid and received the phone and now he's saying he can't activate because its already programmed for the phone number on my account and its asking for the last four of my SSN. I removed the SIM card before i shipped it. Is this legit? or a some kind of scam to get part of my social. He called me and left a VM for me and my g/f. Her phone is the 2nd line and he said it showed when he tried to activate it so he called thinkin it was me. Is this a real situation?? Should i give him the last four of my social? or is an elaborate scam...he's already paid me the $755 for the phone.