Same thing here. Called my cell phone - rang once and hung up.

23 seconds of silence on the answering machine from them.

Caller ID shows Colorado.  No vm and I called back, silent...  suspicius.

thanks everyone.  I use the site to decide who to block, if I do not get to answer it in time.  I love my iPhone as I can block hundreds of numbers.  I am so tired of scam calls, they disrupt my life.  Oh there is no chance of me being scammed by these dolts.  When I do have a chance to speak to them I either try to keep them on the line for a long as possible.  It steals their time.  Also, I am retired and it gives me something to do if I am not busy.  When I am not busy it lets me brush up on my cussing and insulting.  I am getting pretty good at insulting as usually I can get them very mad. hahahahah

Rang twice, then hung up. No message.