SIM808 GPRS/GSM+GPS Shield is a GSM and GPS two-in-one function module. It is based on the latest GSM/GPS module SIM808 from SIMCOM, supports GSM/GPRS Quad-Band network and combines GPS technology for satellite navigation.It has high GPS receive sensitivity with 22 tracking and 66 acquisition receiver channels.It has tandard 4-pole TRRS headphone jack so that you can use any 'Android' or 'iPhone'-compatible headset with mic. Also breakouts for external 32Ω speaker and electret mic if you don't want to use a headphone
This module can do just about everything, like make and receive voice calls using a headset or an external 32Ω speaker+electret microphone, send and receive SMS messages or send and receive GPRS data (TCP/IP, HTTP, etc.).
Now we has developed a new function for this board, it's become a GSM/GPS/Bluetooth three-in-one function module now. We improve our versions by upgrading bluetooth firmware. The new AT command for bluetooth also has been upgraded in the wiki.