said they were from Denver, CO, don't know anyone there so I ignored it. I assume it's a telemarketer or scammer

Ahhh...the joys of the modern American wit...Laugh Out Loud, I must say

I got a call from this number. They wouldn't identify themselves. Trying to sell something. I hung up.

Just got the call. Ignored it then called back. The only thing the pre-recorded voiced said is to "Press 1 if you'd like to be on the no-call list".

message said: "Friend or neighbor you were eligible to receive a free wireless home security system there is no cost for equipment or installation and the system is monitored 24 hours a day by your local police fire and medical you must be a home owner to take advantage in this special offer if you were interested in having the system installed at no cost to you then please press one now once again press 1 now. Otherwise, Please press 2 to be removed from our calling list."