A single line phone uses only two wires, usually the red and green, which
connect to the center two terminals of the phone jack box. The other two
(black and yellow ) are not used. If you're getting a dial tone on that
bedroom jack and it's a different number, you've got a second line. It's
still active or there would be no dial tone. (Call a friend that has caller
ID to find out the number) When a former resident moves out and calls the
phone Co to disconnect, they don't actually physically disconnect any wires.
It's simply a programming function that disables that line until the next
resident gets a 'hook up'. If it's disabled, you'd measure 48 volts DC
between the two leads, but would not get a dial tone.

"Elize" wrote in message
om...
Please help me if you can.

I recently moved in new complex apt. in Chicago, IL
and found one of three phone jack in master bedroom
not working. One possibility is the ex-resident used
second phone line on it.

The landlord refuges to pay SBC tech service fee for
merging two phone lines to one, cost about $100.

Anyone can help me out how to fix the problem?
Landlord allows me to access the phone line box.
It is easy to fix it by myself?

The living room phone jack has 24 wires and 4 wires
used for living room phone jack. I can't check the
another phone jack in the small room. The phone
jack in master bedroom has 6 wires and 4 wires
connected to the phone jack. I hooked the 4 wires
of the same colors used for master bedroom phone jack
to the living room phone jack and I get dial tone.
Oops, it's different number.