There are plenty of awesome wearable devices that help you stay connected these days. This Communicator Watch is not the most compact wearable device, but it does remind us of personal communication devices from certain popular movies. Communicator Watch not only keeps accurate time down to the millisecond, it also lets you receive calls.
The developers used a Teensy 3.1, a FONA GSM module, CR1220 battery, a mini speaker, a rotary encoder, and a few other parts to complete this project. Aleator777 has shared the instructions on Instuctables.com.