Las Vegas too
There have been various rumors, insinuations etc. going back to the 1980s that the switching system in Vegas is compromised. Mostly, it was supposedly stuff such as escort services having phone trouble. They wouldn't pay up "protection" money, and instead of having Vinny come by and break some kneecaps, the phone would quit ringing and so business would grind to a dead halt. Calls would get diverted to some other company. Or, calls would go through, the escort would show up and the customer was already being "serviced" -- another escort had beat them there.
My recollection was this was covered in an old issue of Phrack. Hotel switchboards said it couldn't be them, so then people pointed the finger at Sprint who (at least at the time) provided landline service; they claimed attacks on the switching system were impossible and pointed the finger back at the switchboards. Who was it really? I don't know. I also don't live anywhere near Vegas, and haven't ordered any escorts when I've visited, and certainly wouldn't know if they came from the right company if I had 8-). So I don't know if this is ongoing or not.