Hi, Could someone tell me (knowledge please, not a guess) whether an LTE signal will do better penetrating the concrete/steel walls of an office building than GSM? I currently have an AT&T iPhone 4, and the service inside my office in NYC is horrible, while an old Verizon CDMA phone works fine. I was thinking of switching to Verizon for my iPhone 5, but I'm not sure I want to give up the simultaneous voice/data capability that AT&T provides. If I could get some concrete (pun intended) info on the LTE capability to feel more confident, I think I would prefer to stay with AT&T. Anyone who can help would be much appreciated. Thanks.