Just an additional.  You wrote :  "...My problem is having to go up the road about a mile and turn on airplane mode and turn it back off to get a sufficient signal to make a call. Most of the time, I am roaming. "

This does make me think your phone is not able to switch between wifi calling and cellular.  Either because you're in a roaming area, or the phone is defective.  Android has a smart switch which auto changes phones between connections.   Sometimes it fails, is turned off, or has been fouled up by an update.