Elecrow SIM808 module takes the top 10 best-sellers for several months.
Now we have 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 SIM808 bluetooth firmware. The new SIM808 AT commands for bluetooth also has been upgraded in the wiki of SIM808 datasheet.
And if you want to update your old version SIM808 shield, we also provide tutorial(How to upgrade firmware of SMI808 Arduino Shield) and SIM808 accessory(antenna) that you need.
Elecrow has an original SIM808 project to realize remote control function. This is the most viewed tutorials on Elecrow instructables Channel, Remote Control Via SIM808 GPRS/GSM Shield.