The SMSsenger bag uses the wiring in this guide, with the addition of a flex NeoPixel matrix to display received SMSs, and is a good example project on which to base your own SMS Fona project!
Geofencing with the FONA 808 & Adafruit IO - Build a geofencing project that will send alerts when it goes out of the perimeter!
Track Your Treats: Halloween Candy GPS Tracker - This GPS logging + marking project could easily be used for any route-tracking wearables!