Old Telephone Handset with Smartphone!

Shown here, is how you can use a vintage telephone handset (of the classic rotary phone) with a modern Android (Samsung Galaxy Note 8) smartphone. NOTE, GOOD NEWS: This has also been tested using an iPhone (with headphone jack adapter) and works well with it. This is not a modern Bluetooth device, but using the handset with authentic vintage hardware, including the carbon microphone!! This way, you can have cell phone telephone conversations where the person on the other line hears your voice through a carbon microphone, just like in the Ye Ole Days of Ma Bell. A 1.2kΩ resistor is required in series with the smartphone's microphone input so the phone will detect it as an external mike. The power from the phone usually used to power the condenser mike will power the carbon one. The left audio channel drives the handset's original speaker. The schematic shown in here, with the resistor values for "forward" and "reverse" is from: https://forums.androidcentral.com/samsung-galaxy-s4/334540-galaxy-s4-headset-mic-button-wiring-schematic-pinout.html The phone is demonstrated at the end of the video with a legitimate phone call (I had permission to post it to YouTube from my friend "He-Man" who I called). For interested parties, at the beginning of the video, the initial person on the "lock screen" is my cousin Emrys, and the "home screen" image is of my brother, Chris. We get along well these days. He is a lover of video games, computers, and the like. He is a programmer. I hope you enjoy this video.