IPhone 4  "No SIM card installed"  even though the SIM card is  in there

Hi,since today I have no mobile phone network on the iPhone. Whenever I start it up it says: No SIM card installed. Although they put in it. I switched the iPhone several times, and took out the SIM card and inside she put back in, but nothing happened there. Does anyone know what could be the problem? Thanks

Could be a bad SIM card. My son's iPhone 4 started doing the same thing so I took it to a local AT&T store and they replaced the SIM for free. It's worked every since.

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