Had the same problem. Try turning off lte/ 4G
The calls will start coming in again.
Anyone else with this problem and managed to solve it ?
I hope this fixes the problem of calls going directly to voicemail.
Edit: Not fixed
I hope I don't have to wipe the phone and start fresh. Even though the feedback app says more than 10 reports are similar (it's like nothing compared to the massive amount of people on beta).
Was hoping the calls going to voicemail bug would get fixed...
Guess I'm staying on iOS 12.