I have a just over 1 year-old Samsung S21 5G phone.
For the first year, the phone and service has been great. We're in a marginal 5G but strong 4G area according to your map, and have been customers in this location for more than 15 years.
For the last several months, I have not been able to use my phone reliably inside our home at all. My wife's Moto G Stylus (4G only) works flawlessly inside the house.
I have had really bad or unusable connections, but ONLY here inside the house. My phone shows 1-2 (rarely 3) bars of 4G/LTE or 5G signal, depending on where I am in the house. But I can't get a reliable phone call on cell service except when I stand in front of one particular window in the house, and WiFi Calling doesn't seem to help at all.
I have WiFi calling and Video calling activated, and we have excellent (100+mbs) internet with a strong mesh router system that covers the whole house at full speed.
I've tried making and receiving calls with and without WiFi Calling on, and it doesn't seem to matter.
I've tried everything. Checking for software updates (I'm on G991USQS5CVI8 now, but nothing has changed after the last several updates.)
I've rebooted the phone.
I've rebooted the router (even though every other internet device in the house works fine, and I get about 100mbs on WiFi tests on the phone.
All internet apps and browsers work fine on WiFi at home.
The phone works fine everywhere else I use it. But for some reason, I can't get it to work reliably either on cell service, or WiFi calling at home.
What is going on? This problem started several months ago (maybe 4-6?), but I can't tell you exactly when. I kept thinking it would get better, and that maybe a tower was messed up.
But now I have a nearly $800 phone that doesn't work as well as my wife's 4G Moto G that cost 1/3 as much. And I'm getting pretty fed up with it. We've been customers for many years, precisely because of the good reliable service we've had. But this is getting unbearable, and I'm seriously considering changing carriers.
What can I try?