I live in the country with poor cell tower coverage which kept dropping my phone calls. I called AT&T (my wireless carrier) and had to request they unlock wifi calling on my phones (wife and myself). This was about 2 years ago and calls work great now when I am at home. Call AT&T and tell them you have bad coverage. There is a setting as I recall to change on your phone, but they still need to do something on their end to make it work.
I live in the country with poor cell tower coverage which kept dropping my phone calls. I called AT&T (my wireless carrier) and had to request they unlock wifi calling on my phones (wife and myself). This was about 2 years ago and calls work great now when I am at home. Call AT&T and tell them you have bad coverage. There is a setting as I recall to change on your phone, but they still need to do something on their end to make it work.