I was just called by this number. They left no voicemail, so I immediately called back. A recording said the number was out of service! Literally 1 minute after they called me?
Called my cell. Two rings and then stopped w/o leaving a voicemail.
Months ago I made a special Blocked Calls "person" in my phone address book that has a silent ring and is configured to send all calls directly to voicemail. I add junk numbers and scammers to this contact, and if a call comes from any of the numbers I never know about it (they never leave messages...). At the moment I must have 25 numbers assigned to the "Blocked Calls" contact.