My phone is getting "Unfortunately the process com.android.phone has stopped"

[Android Central Question]

My phone is getting "Unfortunately the process com.android.phone has stopped." I see reports on various forums for dozens of different android phones, tablets, etc. Have tried a number of fixes to no avail.

 

[B. Diddy]

Welcome to Android Central! Which phone? What fixes have you tried? It would help to know, so that we don't suggest things you've already tried.