Adafruit Adafruit FONA 808 - Mini Cellular GSM + GPS Breakout [ADA2542]

Quad-band 850/900/1800/1900MHz - connect onto any global GSM network with any 2G SIM (in the USA, T-Mobile is suggested) Fully-integrated GPS (MT3336 chipset) that can be controlled and query over the same serial port Make and receive voice calls using a headset or an external 32Ω speaker + electret microphone Send and receive SMS messages, GPRS data (TCP/IP, HTTP, etc) This module measures only 1.75"x1.6" but packs a surprising amount of technology into it's little frame. At the heart is a powerful GSM cellular module (we use the latest SIM808) with integrated GPS. This module can do just about everything.