Live in Casper, received call about 8pm. Did a reverse lookup. Cheyenne number-landline from Level 3 Communications if not been ported to another carrier. reverselookup.com says info available on caller for a price. Did not answer. Left message of semi heavy breathing.
hung up when I answered. Feels a lot like a telemarketing search call where they are wanting to verify if business/residential number and/or active/valid.
It's not local for Casper.