Originally Posted by preaseunderstand
I live in Washington. I went to spokane last weekend and was able to get 4g lte there with my i545 on global mode. But now that I'm back in my hometown I only get edge, I used to get hspa+ here on my old phone.
That means you're in an area where TMobile has not yet refarmed HSPA+ to the 1900Mhz PCS band. The i545 has access to the AWS (1700Mhz/2100Mhz) spectrum for LTE, but it cannot access it on the PCS side. I believe the HTC One GPe operates the same way. See the article below. TMobile runs HSPA on the AWS spectrum, except in places where it has been refarmed to 1900Mhz.
Essentially, the i545 will only pickup TMobile's HSPA when it's on 1900Mhz. Since their HSPA network is on the AWS band in most places, you won't be able to get onto that network without a capable device. Here in NYC, the HSPA network has been refarmed to their 1900Mhz band, which the i545 is capable of accessing.