Iphone can't make or receive calls?

I have an iphone 5s on sprint and any time i make a call it says the number i called is invalid or does not exist. When people try to call me it tells them that the number they are calling (mine) is not accepting calls at this time. My "do not disturb" mode is NOT on and my call forwarding is not on. Also i called sprint and they said everything looks fine on their end. I've also reset my phone several times and nothing. If anyone can help please

Contact Apple Care for technical support or sign up online for Apple Genious Bar appointment at your nearest Apple retail store. All the best.

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