When out of cell range, you need a watch that lasts more then 24 hours and can radio for help. Pebble Time with SurvivalStrap is here.

Platform for pebble and imp. Tells you bus time-to-arrival on your watchface, and flashes pretty leds when it's getting close.

Go running with only one device - your smartwatch - and still enjoy all your music, GPS tracking, and more!

Control games using your smartwatch!

A smartstrap for Pebble that acts as a USB keyboard. Combined with the watch app, it can keep your passwords handy at all times.