Trying to help a friend in need here, hoping I can get some clarification from the community. I had an original 16GB iPhone, and recently upgraded to an iPhone 3GS (huge difference, btw). A friend of mine, an iPhone 3G owner, just lost his phone this past weekend. I have offered to loan him my original iPhone. What do I need to do to clear out my phone's settings and get him running on my old iPhone? Is there anything special here and is it a violation of AT&Ts terms or is this a normal practice? Does he need to go buy a new SIM card and drop that in my phone? He only needs it for a few days until he can either locate his old phone or buy a new one, so I'd like to help him out however I can.