current: @adafruit - previous: MAKE, popular science, hackaday, engadget, fallon, braincraft ... howtoons, 2600... View more articles by Phillip Torrone I’ve been having a lot of fun with the Portable Rotary Phone from Spark Fun Electronics. It’s a GSM cell phone built inside an old rotary phone. You pop your SIM card in, it dials out, rings and acts just like an old fashion phone, but it’s now my