incoming call banner says User Busy and goes to my voicemail

slelals wrote:

Iphone 13 Pro up to date on updates just started not accepting incoming calls. The banner shows with the caller and says user busy and the goes directly to voicemail. I have made sure no focus is on. Airplane mode is not on. I have reset the network. I also did all reset (have not done factory reset) as well as removed sim card and placed it back in. No matter what I do i am not able to get incoming calls. My son has an iphone 11 and we use the same carrier and plan and he has no issues. I checked and there are not any new apple updates nor is there a new carrier update. At a complete loss. I do not have an itunes accound on a computer to back up to just my icloud and i am nervous to rely on that if I factory reset.

Any suggestions? Thoughts?

If you can't make or receive calls on your iPhone - Apple Support