Adafruit FONA 808 Cellular and GPS Shield adds location tracking, voice, text/SMS, and data to an existing project. The FONA uses the SIM808 module for cellular connectivity and can connect to any global GSM network with any 2G SIM. GPS is available via the MT3336 chipset and can be controlled over the serial connection. Onboard LiPo battery charging circuitry is available to recharge a connected battery.
Quad-band 850/900/1800/1900MHz - connect onto any global GSM network with any 2G SIM
Fully-integrated GPS (MT3336 chipset) that can be controlled and queried over the same serial port
Make and receive voice calls using a headset or an external 32O speaker + electret microphone
Send and receive SMS messages
Send and receive GPRS data (TCP/IP, HTTP, etc.)
PWM/Buzzer vibrational motor control
AT command interface with "auto baud" detection
Onboard LiPoly battery charging circuitry. Two indication LEDs display the charging status.