Why isn't my Android M5 receiving calls?

[AC Question]

my android M5 is not receiving calls

when being called its saying line busy

 

[VidJunky]

Re: my android M5 is not receiving calls

You can call out? Busy sounds like a provider issue. Have you attempted to call someone in your area with the same provider. I assume you're getting texts from those attempting to call, or how do you know calls aren't getting through and ringing busy in the other end? Is it all calls?

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