Just recently I've been getting the "No Sim Card" Error on my Iphone. Most time I can just restart the iphone and it work's fine sometimes that won't work and I got to take the sim out of the phone and put it back in. Do you know what is causing this? I would take it to the apple store but I have a few scratches on the back and I was told on the phone by Apple that once they seen those scratches they would say it was damaged due to dropping and they couldn't do nothing about it. Which the scratches are from when I put my car key's in the wrong pocket.