Adafruit FONA 808 Shield - Mini Cellular GSM + GPS for Arduino

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This shield fits right over your Arduino or compatible. At the heart is a powerful GSM cellular module (we use the latest SIM808) with integrated GPS. This module can do just about everything

• 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 (MT3337 chipset with -165 dBm tracking sensitivity) 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
• Send and receive GPRS data (TCP/IP, HTTP, etc.)
• PWM/Buzzer vibrational motor control
• AT command interface with "auto baud" detection

Here's the GPS specifications:

• 22 tracking /66 acquisition channels
• GPS L1 C/A code
• Sensitivity
  Tracking: -165 dBm
  Cold starts : -148 dBm
• Time-To-First-Fix
  Cold starts: 32s (typ.)
  Hot starts: 1s (typ.)
  Warm starts: 5s (typ.)
• Accuracy: approx 2.5 meters