Turn an old phone into a Guestbook that people can leave personalized messages. Great for weddings, birthdays, product launches and other special events!

Kit includes:

You will need:

  • A landline-style phone
  • Soldering iron and solder for the pin headers
  • Electrical tape, or terminal block for wire connections
  • Wire cutters and strippers


Original design by Playful Technology on Youtube. You can follow his build guide, with timestamped chapters, here:

Make your own wedding audio guestbook - a step-by-step guide!

**If you have technical issues, check this forum post from the official Teensy forums to davice.