I have been with ALL U.S. cellphone carriers trying to solve this problem—incrementally upgrading from iPhone 10 to 14 (and each model between)—over the last few years, and Comcast Xfinity is my last hope. The same problem continues:

Cell phone incoming calls go straight to voicemail

I never get through to Xfinity, getting put on terminal hold. They fixed it in August 2023, but it started again when Xfinity technicians were working to upgrade my area over the past week.

Any advice?