Places I haven't picked up an LTE signal:
Baton Rouge, LA
New Orleans, LA
Fort Wayne, IN
What a complete joke how AT&T is managing the Philadelphia, Pa market. Being around the 5th largest city in the US doesn't hold much merit in AT&T's eyes. The network is constantly over congested resulting in non-existent data connections and dropped/failed call attempts. It seems pretty obvious AT&T would rather half-*** their LTE roll out by avoiding most of their larger markets and focusing on small towns so they can claim more total "LTE Markets".