You can use one of these to trace wires in a wall:
(Amazon.com product link shortened)
but if you have an unfinished basement or attic, it might be better/faster/cheaper/easier to just run a new twisted pair cat5 cable.
I found the cable hiding behind the wallpaper.
I expected to find the end of the cable but I found a loop. See photo at:
How do I install a telephone jack to this cable?
Note: My house has three working phone jacks so I don't want to mess them up
Normally only 2 wires are used, the red and green. There are probably 4
wires in the cable with 2 not used unless you have more than one line.
A common telephone circuit is just 2 parallel wires, the red and green.
Whatever phones you have just hook across those lines. The line will
normally have less than 15 volts on it,so safe to work on unless someone
dials in and you get the 90 volts of puslating voltage. Probably will
not harm you,but will sure make you jump and hirt yourself.
If you want a phone jack at that spot, just cut the wires, and find a
phone jack that has 4 screws in it. If you are careful you can just
peel back the insulation on the red and green wires and put them under
the correct screws of the new jack with out even cutting the wires. Not
often,but sometimes you will have to reverse the red and green wires
going to the phone to make them work and ring.
Get a jack same/similar to this:
(Amazon.com product link shortened)03953398&sr=8-6&keywords=telephone+jack
Depending on how the wire is routed behind the walls, other phones may
be "downstream" from here, that's why it is looped, so try not to cut
the wires, but trim back enough insulation to loop the wires under the
Use a wire stripper if available, otherwise small sharp knife like an
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