Pixel 4 XL Server Error

Been unable to use my phone to make or receive calls. When I try to make a call it fails immediately and gives a message saying "Server Error. Try again later." Anyone who tries to call me says it goes straight to voicemail and I also get a missed call notification. This started late last night. I have restarted the phone multiple times with no success. I am able to use my phone otherwise (texting, internet browsing, youtube, etc.) so I am really not sure what the problem is.