Trying to make or receive a phone call and there is constant background buzzing noise?

Trying to make or receive a call and there is constant buzzing sound in background.
I reset the phone.
I updated network setting on Verizon.
I can play music with no trouble.
Speaker mode works on phone.

Did you use the latest backup after setting it up "as new device"? If yes, try again, this time without using the backup, maybe it contains damaged data causing your problem.
If this does not bring any change, you should get it serviced.

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