Originally Posted by Duwenbasden
From the HTC site: M7/Verizon: ... UMTS/HSPA 1900/2100MHz,GSM/GPRS/EDGE 850/900/1800/1900MHz, LTE Band 13
So you need to check if TMOUS has 3G 1900 in your area. 4G is entirely out of the question.
You are wrong. HTC one UMTS/HSPA 900/2100, not 1900/2100. So it can't use 3G on AT&T or Tmobile
Motorola 328c->Motorola a6188->Nokia 6610->Nokia n73->Nokia n900->iPhone 4s->iPhone 5 64GB & iPhone 5 16GB & Samsung Galaxy note & HTC One M7 & Nexus 7 2013 32GB & iPad 4th 16GB