That recording is typical of recently-activated cell phones. Troublemakers like using cheap no-contract cell phones, which are hard to track down and can be abandoned after they run out of minutes, or if they think law enforcement is closing in on them, or if the numbers they are calling block them.
Pickup and looking for my Dad's name with up beat tone. Ask what's regarding, he said regarding my Dad...I just slam the phone....my dad had passed away more than a yr ago. @sshole. Blocked!!