Rotary Cell Phone ( Description and Build)

My open source rotary cell phone went viral (surprisingly, to me and my husband), and people seem to be interested in it. The original description with links to notes and design files is here: and a starter kit is now available here: The answer to the question why goes from the beginning to 6:12. The description of how to use the phone goes from 6:13 to 14:45. The build portion of the video goes from 14:45 to the end and