No doubt these were persons and phone numbers which Billy wanted no record of his ever having contacted. Launder them through the hotel switchboard and keep them off his cell phone records (which at some point could be subject to subpeona). All the while sticking someone else with the bill.
This behavior is a close cousin to deleting evidentiary emails or meeting on a private plane on the tarmac.
Words can’t express how corrupt these folks are, to the core.
The American people are blind to official corruption because many are so corrupt themselves.