How come at snowshoe there is no cell phone coverage is it because of the observation?

Probably so. There is a large quiet zone in that are. No cell towers are permitted.

I get a signal on Snowshoe. Get T-MOBILE.

The radio quiet zone restricts broadcasting within a certain distance of the observatory. There is a white truck that drives around looking for RFI or radio frequency interference. The strictest restrictions apply within the immediate 10 mile radius where they don't allow wifi or even microwave ovens.

Yes it is because of them. When we visited the area, we were told AT&T had best reception, have verizon, nothing.

You got it Nicolas.