We bought an Iphone 3gs from a friend yesterday. Everything was fine for about ten minutes. The iphone restarted itself. When it would boot back up "connect to itunes" pops up. When we connect to itunes it trys to load but before I can do anything- the phone restarts. It does this over and over. We let the battery die all the way before trying again. It then let us go to the main home where we can get to the settings(where we did the update). After several minutes it restarts again. We have taken out the sim card but the problem persists. Most of the time we can't get past the connect to itunes. We have yet to activate service since we can't keep it on long enough. Any suggestions on why it keeps restarting?