Who called from 7206398017

Per Mr. Number website (http://mrnumber.com/1-720-639-8017), "1-720-639-8017 is not a valid number. If you are sure that you got a phone call from a number beginning with this prefix, the caller may have 'spoofed' caller ID. "

let it ring , then no message,,,same as everyone here..

Same here, no msg was left. Mustve not been that important...

Answered and they just hung up.

No message.  Caller ID showed "WBC Relief," which Googled as World's Best Cream, a product for arthritis. However, the contact numbers on the website were different.