They called my daughter and said I was $600 past due, which I'm not. When I called back and individual answered, so I hung up. I immediately called Verizon and they do not use this number, nor did they make business calls on a personal cell line. It's a scam to get credit card information.
Caution, 623-208-5218 is a "spoofed" number, which means that whoever called you "tricked" your caller ID to display an incorrect phone number. Telemarketers do this so you cannot complain, but they failed... you can still file a complaint here to fight back against unethical telemarketers.