Since upgrading to IOS 9.2 my iPhone 6 won’t ring and goes straight to voice mail. The do not disturb, mute or airplane mode is not activated. I have reset the carrier settings and still the phone goes to voice mail. can I wind back to 9.1?

Have tried the usual fixes of restart phone, wipe out all diverts, activate and deactivate do not disturb, turn off bluetooth and on off airplane mode from the forum suggestions. Think I should rest the IOS to 9.1 and not...
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