iPhone going to voicemail after 1 ring

Hello and thank you for reaching out to  Support Communities.

This sounds quite frustrating, let's take a look at some other device settings that might explain the issue.

Are you able to verify that 'Silence Unknown Callers' is not enabled? (Settings > Phone > Silence Unknown Callers)?

Are you currently using a physical SIM card, and do you have another device available where you can insert your SIM card to see if the issue persists?

There is always the possibility of a software based error, in which case you may need to factory reset your device.

Let me know if this helps, and if the issue persists let's troubleshoot further.

Best,

Jas

This is also happening to me! Started in the last few days, and i have checked every setting known to man. I am on AT&T and thought it was a carrier thing, but nope. any advice?