Who called from 3076557550

I answered and it was an automated message. They said it was the FBI and they wanted to put a sign in my head and install a free security system. Then it said press 9 to be added to a do-not-call list.

Mystery call, no msg.

Called cell and did not leave a message. Number only ranf line for two rings.

I got this call and it only rang twice. I called it back got a recording not identifying any thing it just said "Press any key to be removed from this list it may take up to 48 hours."

Called cell. Don't know them.