My iPhone4 is not receiving calls?

Two days ago my iPhone was receiving calls normally, Just today my friend and my mom both told me they can't reach me and my phone doesn't ring at all or even show a missed call!
according to my mom it says something like " this user disabled getting calls " or something like that. What do I do?! I'm waiting for an important call!

Your SIM-Card might be ruined. It might be time for a new phone. Its been over two years hopefully, so you can get an upgrade

Iphone 4 has the death grip issue so probably you may be covering the bottom of the phone with your hand or something and blocking network signal

Turn off do not disturb.

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