I missed a call from this number and they did not leave a voicemail. When I called it back (assuming it was a spammer) it goes to a dial tone. I just blocked it.
I picked up. It was a home security company. Started as an automated message, I pressed 0 and spoke to someone there. Told them I wanted more information about their company as using an automated dialer to call a cell phone is not legal. She then hung up on me.