FONA 808 - Mini Cellular GSM + GPS Breakout

Adafruit FONA 808 MiniGSM + GPS, an all-in-one cellular phone module with that lets you add location-tracking, voice, text, SMS and data to your project in a little package. At the heart is a powerful GSM cellular module SIM808 with integrated GPS.

More information is available on the website of Adafruit.