[B4Ranch]

Look inside the phone jack, locate the red and green wires that are part of the jack. Connect the red and green wires on the phone cord and connect them under the red and green wired screws of the jack. You should have dial tone.

[Disambiguator]

Thanks. I’ll have to get some cord, as this phone came from a demolition site, and they cut it off flush against the housing. It’s old enough so there is not an RJ-11 jack on the phone itself.

[Does so]

I've converted many a personal phone like yours.

Flip the phone over, remove the screws that hold the plastic cover on. Look for the terminals to which the old red and green wires attach. Find any modern (oval) cord, and "tease-out" the red and green wires yourself, as there are other, un-needed wires within the cord. Slide the new red and green wires under the same screws—tighten. Re-attach the plastic cover—you're done!