Nevertheless, I really like this hack. This really save a lot of money but requires a certain level of soldering skill. If you have a old wireless phone around and bold enough try it out! By having the phone off hook I carefully inserted my little screwdriver here and there until a heard a click in the handset. And when I found that click I injected a signal from my MP3 player – and it worked! Then reverse, by blowing in the handsets microphone I used the regular headphone for my MP3 player to see where I could ‘hear’ the phone. By grounding on wire and using the other as a probe I quickly found the spot next to the first spot. Build a Skype phone ..or how to make use of that old wireless phone just laying around – [Jarnaker.com]
