Thanks, I'll take a read at that link.
Thing is, the phone plug was already unplugged when I opened the phone box.
However, I am using AT&T's home phone service at the moment.
So I have service with every jack in my house, its with AT&T, even though the phone plug in the phone box is unplugged.
Side note, I plugged in a spare phone to that phone plug in the phone box and tried to dial my cell phone. It came up as a different number than my normal home number, same area code. Strange?