My iphone sim card won't work?

I have had my iphone for 6 months now.than suddenly it started saying 'no sim card' on the top left hand side corner. I live pretty far from an apple store so i can't go there.

Turn the phone off and pop the SIM card out then put it back in and turn the phone on.

Here are instructions: http://support.apple.com/.../kb/HT5163

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