My caller ID showed an Unknown number with no message left.  Therefore, that = telemarketers and or scammers.   Most of these are "robo calls with spoofed numbers," so reporting them does no good.  Be warned, many of them are now using your local area codes and change the main number frequently.  NEVER give or verify personal, credit card, bank or financial information to ANYONE who makes an unsolicited call to you!!!  I "block" these numbers if they keep calling.