Recently, I've been having problems with my 3GS. Sometimes I can't seem to text or call even though I have full bar of service. Then I usually try to shut down the phone and try to start it. When I try to shut it down, it would show the "loading" logo, then my lock screen would magically appear, then couple seconds later, the phone would shut down. Anyone experiencing this? And does anyone have a cure? And yes I have done a restore.