My iPhone does not recognises SIM?

My iPhone is the 1st generation 8gb phone. The problem is although i installed SIM card in it it says "SIM not Installed". I tried swithcing off the phone an on it with the SIM, still it says the same....rest all features like WiFi etc are working.

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I noticed you never got an answer to this. Are you still having this problem

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hi, i'm using this what they called high card/GB sim to use other network provider with an unlocked iPhone 4s, it was working for 3yrs, I tried to remove my sim card & put it back in, now my phone doesn't recognize my GB sim to get passed the activation process. pls help. thanks!

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