Who called from 7203791368

Have started receiving calls on a daily basis from numbers in the Denver/Boulder area. All calls are from area codes 303 and 720 and Caller ID shows "Denver". All calls are from numbers I do not know or recognize. Unknown callers never leave messages. I do not answer calls from numbers I do not know.

No idea - no message.

This number has been calling me too, along with similar numbers.  I have not picked up, but it is definitely annoying.