I used my phone this morning, no problem and turned it off. I just went to turn it on and it showed a sync usb cable picture and itunes and a Slide for Emergency bar, which allows me to make a call. There was No Service in the upper left. I plugged it in to my Macbook and a window popped up that it was activated. What is going on? I have a 3G iPhone 16GB in NJ area with AT&T.