I recently bought an iPhone on ebay... (the original iPhone) In complete working condition. When I got it, It said insert sim.... so I did I had an AT&T Sim I was going to use with it. Well it stopped saying insert sim, and now just says "slide for emergency" at the bottom, and has a depiction of a USB cable with an arrow into the itunes Icon... so should I connect it to the computer.. what do I do?