On 5/17/17 I got a call from "Upper Marlboro, MD" from this number, and they did not leave a message. I don't answer calls that don't show up on my caller ID, thinking they are scammers when they don't leave a message, and I always block them.
Cell phone companies selling for profit your number to these dirt bags. Don't blame the dirt bag scammers, blame your cell phone providers, they are the ultimate dirt bags !!