Same problem. Been working from home since March due to pandemic and need this phone to be reliable for non-stop meetings and it's anything but that. Live in cellular dead zone. Have Verizon IPhone X that worked perfectly on my old Comcast wiFi router untill I upgraded my Comcast package to 600Mb w/ phone service and the brand new WiFi 6 router in Oct'20. All OS and Carrier versions are current on phone. Dropps calls daily and at their worst in the afternoon. Drops 3-5 times / 30 min conference call. Went through Level 1 support and they said I needed a new driver from Apple. Called Apple Tech support and they said there is no such thing. Apple said call Verizon and tell them that I currently have something called "Short Call codes" and that Verizon needs to change be to "Long Call codes" . THis is not what I signed up for when I upgrade Comcast. I've been with them for nearly 19 years and was one of their initial beta test cable modem subsscribers. At the price I pay per month this is a common flaw and needs attention from Comcast! Fix this Comcast. Own the problem. This is not acceptable!
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