They can make a Faraday's cage of the hotel preventing all external radio signals to enter or exit the hotel, but it's going to be expensive. And it might also be questionable from an emergency service point of view.
Or locate the hotel in a location far away from everything else. But nobody would want to stay at that hotel.
The only reason that the hotels want this is to be able to profit from services that people are used to get for next to nothing.