Who called from 3017611202

Got a call just now from this number. Caller id just says UNKNOWN NAME.  I didn't answer and they didn't leave a message.

I just got one today.

They have called me 5 times in the last couple of weeks. Other sites say they call cell phones and they are a charity.

Called today.  Name not available.  No message. Now blocked

Received a call today from 301-761-1202 which caller-id displayed as "Not Available".  I recently bought a new phone that blocks numbers.  This number will be blocked.  I did call the number back on another line that I use for outgoing calls only; and the line appeared dead for 7 seconds then a busy signal was heard.