They couldn't ring through because I have a call blocker. Googled the number and found another site (number guru) that has 3 reports saying they received spam text about winning a cruise. I have all the spam "free cruise" numbers blocked so maybe they're trying a new number. 520 is Tucson.
Call comes in and they don't leave a message, You cannot call them back , you get an error message. Google sites and Bing find this number to be a scam. Only shows as Tucson AZ on the caller id.