My iPhone 4s has been in and off telling me "SIM failure" when I text some people. It also just says "call ended" whenever I try to call someone, the last thing it has been doing is saying "No Service" where it is supposed to say Verizon. Please help!

My iPhone 4s has been on and off telling me SIM failure" when I text someone. It has also ended my calls when I try to make them. The other thing it is doing is saying "No Service" at the top left corner where it is supposed to say Verizon. I can't figure out how to fix it. please help!

See the iPhone Call and Connection Assistant for troubleshooting steps.

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