Any number that comes up on my cell phone, without being identified must leave a message and I will call back if it is a real call. All others we are now keeping a list of the sales calls to turn over to the FCC since we are on the "do not call list". You only have to have a name or number to file the complaint. Lately we are getting local calls that start " Since you have stayed in one of our resorts recently....". I have never been to any kind of resort!