My iPhone says there's no sim card installed but there's one?

My phone has been working fine but up till a couple days ago, a message popped up saying there wasn't a sim installed. I hadn't touched the sim card at all. I have been turning it off and on and its been my only solution but it keeps happening. Its getting pretty annoying so any ideas?

Same thing happened to me on Sprint. Call your carrier and give them the # on the SIM card. They will reset this in your account and that message will go away.

Restart your phone

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