Why does my iPhone 4 keep saying no sim card

my iphone 4 keeps randomly saying no sim card and i havent dropped it and its in a otter box but its getting really annoying. restarting the phone sometimes works, and taking the sim card out and putting it back in works but im tired of doing that all the time. how can i fix this?

You might want to get a new SIM from your carrier. If you frequently remove/replace it, the contacts may be worn.

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