WI-Fi Calling

I live in an area that previous had poor cellar reception. In the past I typically only got 1 or two bars on the phone. Even though my cellar reception was poor I very seldom had any problems sending or receiving phone calls. I believe this was because most of my calls were being done using WI-FI and not the cellar network. Last May Verizon upgrade their network in my area. Now I consistently get four or five bars on my phone. Since the cellar network upgrade I am now experiencing problems making or receiving phone calls. Problems include drop calls and/or I can hear the person on the other end but they can't hear me. This only happens when the calls are using the cellar network and not when WI-FI calling is being used. Is there any way to force my phone only to use WI-FI calling when I am at home?