In the early 1980s, Frog Design and Apple partnered on this innovative (at the time) phone prototype, which featured a touchscreen of sorts that could be used to take notes, send messages and more. Believe it or not, this device could also be used to send electronic check payments possibly over a CBBS (Computerized Bulletin Board System) system. Continue reading to see more unreleased Apple products that you might have not seen before.