Received 2 calls on 2 consecutive evenings at 8:50 pm.  Both shown as Not Provided on caller ID. We don't answer any unidentified calls, so both went to the recorder. When I later checked it they were unidentified collect calls. Press 1 to accept, 2 to decline and 3 to block future calls. I won't press anything if they call again. Even pressing 3 may give them access to our phone. Some one posted that they come from Henderson detention center, we live in Henderson, but don't know anyone thats incarcerated.

This is a scam.  Don't answer or don't reply by pressing a number.  Just hang up.

I got this call from 1 am - 3 am continuously and consistingly.
I have hanged up many times and also let my recorder recorded ths message.
Later this morning when I checked my recorder and I found calls are from 866-831-4485.
I called Las Vegas police station and reported these  annonying calls.
They told me to report in person so they can investigate.
They said there is no way to stop such calls.
I want to alert you all of such annoying calls.

This is not a scam. This is actually a number for non-collect calls from inmates at the Las Vegas Detention Center who have just gotten arrested and not been sentenced or even seen a judge yet. I just got a call from this number about 5 minutes ago and spoke to someone I know that had been arrested.