If I recall, you’d stick the straightened paperclip into one of the holes on the mouthpiece and touch the other end of the paperclip to some metal part on main

If I recall, you’d stick the straightened paperclip into one of the holes on the mouthpiece and touch the other end of the paperclip to some metal part on main phone body. War Games used a pull tab from an aluminum can to a similar effect? (It’s been a while.)