In my older house, I have phone jacks all over the place, and a number of phone lines and multiple wires in cables for more than one line. You used to be able to use a phone repairman shortcut of *91 which played the phone line you were on back to you...but they stopped using it a while ago.
Now I just use the free MCI service 1-800-444-4444 which does the same thing. Obviously, if you only have 1 or 2 lines going into your house, you don't need this.
Now I just use the free MCI service 1-800-444-4444 which does the same thing. Obviously, if you only have 1 or 2 lines going into your house, you don't need this.