I am in Northern NH where Verizon and US Cellular have the strongest coverage. I chose T-Mobile because I found that when T-Mobile LTE signal strength is low the service will automatically jump over to US Cellular Edge. It is slow but usable data and phone calls are fine. The problem is that when I move back into T-Mobile LTE area it will stay on USC until the LTE strength is higher than USC strength as if they have the same priority.
- The neighboring town has T-Mobile LTE. On the drive home the signal strength gradually goes from full strength to about 1 bar
- If I go to an area of the house with no LTE signal or power cycle the phone, it will lock onto USC Edge, full strength
- If I drive back towards the T-Mobile tower it is not until the T-Mobile LTE signal strength is higher than the USC Edge that the phone locks onto the T-Mobile LTE
It seems like there is a priority issue possible giving equivalent priority for when USC upgrades to VoLTE but for now it is a big issue for me. T-Mobile suggested that I manually switch the carrier as I move in and out of fringe areas to which I respond that this was a basic function that should happen automatically. This should be equivalent to T-Mobile changing between HSPA+ and LTE based on signal strength but it isn't functioning this way.
Device: iPhone 7 and iPhone 6S