The hack is fairly simple. He dismantled a Bluetooth headset and placed the components into the rotary phone’s handset. He then connected the headset’s button to the rotary wheel so that when he dials 1, it triggers Siri on his iPhone 4S. Finally, he added the Siri logo to the center of the rotary as a finishing touch.
We’re not sure how useful this is, especially since we’ve come this far because of our desire to not have cords, but as far as a neat little nostalgia project, this one is pretty cool.
source: Cookies & Capacitors via Hack-A-Day