IPhone 13 pro sending calls straight to voivemail

For weeks now, my phone has been randomly sending calls to voicemail almost immediately. I see the call flash across the screen and then it’s gone. I’ve checked everything I’ve found by searching this on Google and nothing has fixed it. It’s not the same person every time, it’s not every call from any specific people. I need help before I have to reset it and reinstall everything. I do have an Apple Watch, but even on a day it was completely dead and I didn’t wear it, the phone problem still happened.