Hello everyone. I am looking into purchasing an unlocked phone, possibly a Huawei. I live in the U.S. and my provider is AT&T. A lot of these Chinese (Oppomart) phones say that they run on something like FDD LTE. Can someone please (In simple terms) please explain what this is and how it differs from a standard LTE? I want to make sure when I purchase a phone that it will run on AT&T LTE. Thanks in advance.