I have Verizon and Thought I was the only one having this problem. Typically as I approach QBP, I can see my LTE bars drop. By the time I leave 36th Ave station, I usually have 2 bars, which drops down to one by the time I reach 39th. After 39th it is a mobile signal dead zone, until I come back above ground in the city. If I'm lucky, on occasion I will get 3G signal in QBP, but even then it tends to be weak.