I've tryed several of them, and can't find one that works on GSM. But I am now convinced that I was lied to, and if fact the closest tower to me not Lte enabled. I ran into something similar when I set my phone to auto select an ATT hotspot, and it will connect to a bad one. The problem there was, I was not getting my pmail where normally I do. In that case I just disabled the free ATT hotspots and all was well. Thats what I need to do with Lte until it gets built out better.