Appears as a missed call on my phone at work.

I just got a call from this number - didn't recognize it so i didn't answer and they left no message.  caller ID was the phone number with no spaces

same here

Telemarketer robocalling about solar panels. Knew it was a scam so I hung up right away. If you get a call from this number, block it ASAP and report it to the FTC.

They just called and I answered. There was no voice on the other end but I could tell someone was there because I heard background noise and then someone hung up 4 seconds later. This is why I never answer unknown calls but I have been getting SO many lately.