I had TMobile before and hated
it. With a burning passion. In a year or so I had to get a replacement about 5 times?! It was ridiculous. After I had to order the 5th, it was time to switch.
I am now on Verizon, and I couldn't be happier! Love it. I have the Android Global, I think? The only issue I have had is that it gets really hot sometimes when used for very long periods, but not every time, which I find odd. Other than that, it is amazing, works perfectly, doesn't lose signal, etc.
I have other friends that have had TONS of problems with their phones. A couple friends tried to talk me out of going with Verizon, it was just that bad.
This makes me think it is a hit-or-miss with them. My guy has it, too, and when we drove from AZ to CA through the desert and mountains he didn't lose service one time!
Sorry to hear you're in the "miss" category, but you should maybe try a new phone??