Calls at all times of the day. Never leaves message on voice mail. Often there is just an open line with people (a calling room) in an office setting mumbling in the background. Today I just listened again, and finally a female voice softly said "hello" four times and then hung up. This number (with number showing) and "Anonymous Call" and "Out Of Area" are now calling at least a dozen times per day and hanging up. Makes us tired!