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.

Received a call from this number twice in a row. I didn't answer and they did not leave a VM.

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.

Answered phone and no response.

Called, didn't answer, they left no voicemail