I might add that many times I do not have issues with VPNs on T-Mobile connecting to my system at home (Yes I still use Mobile G -- if it works why fix it).?? But where I do have issues is:
1) In rural areas.? T-mobile (formally Sprint) has always had good coverage along major roadways and most areas of cities.? But get off the beaten path, you are better off with Verizon and ATT.
2) In high end sections of town with local home owner associations that have blocked putting up cell towers.
3) II very hilly areas where it is hard for cell towers to get good coverage.
Bare in mind that cell companies are constantly upgrading their systems and removing older technologies such as CDMA, 3G, and LTE.? I've had to replace my security system's cell backup 3 times because the services they use have been removed from the cell tower.? I should note that I can see my cell tower at a distance out my front window at home.? For years I had very good cell service at my house.? Then a few years ago during the hype about 5G it become spotty were I had to use WiFi calling.? Now it is good again with the same phone.
