They call and hang-up w/ no message. I get regular calls from this area: Brooklyn / NYC. ALL of them turned-out to be various scams targeting seniors. I stopped calling back to see who the callers were, and "opting-out". This only increases the calls! They will just call back from another number, w/ renewed enthusiasm: (since all that I accomplished was to confirm that I had a valid, active number and could still fog a mirror). I have called and gotten their "expired survey" lie (and tactic to dodge accountability) as well. Thanks you ! to the post, above that explained that one to me.