Got two back to back calls from a blocked number and I rapidly hit speakerphone twice, instantly answering and disconnecting the calls.  These were immediately followed by a call from this number which returns no valid business information on a Google search so I also disconnected this call.  This was immediately followed, again, by another call from a blocked number.  I disconnected the fourth call.  All four were no doubt from the same caller.

Ten minutes pass, next incoming call is from "Anonymous" and is a sales call.  I don't care if you're sales or not, call from a legitimate number.  You expect people to take calls from you but you don't want to be identified?  Says a lot, doesn't it?