This payphone may be found at the City Market gas station south of Granby. It is pretty close to the Ski Granby Ranch. The phone had dial tone, no broken buttons, and rings when called. I was able to call a friend with it.
The phone number is (970) 887-9907.
Man... when i was younger there were so many pay phones. Now, if i see a working one im straight up amazed. 1. that it hasn't been vandalized and 2. It has service. I want to add this number and just call it randomly and see if folks answer. Ill be like you are talking on possibly the last pay phone out in public. Have a good day. And leave it at that. Thanks for the post.
Edit: just tried got a long beep... kinda like a fax machine without the tone changes. Oh well.