Asiawill SIM800 GSM GPRS Add-on V2.0 Module Shield for Raspberry PI Customized for Raspberry Pi Interface Based on SIM800 Quad-Band GSM/GPRS/BT Module Raspberry PI GSM Add-on V2.0 is customized for Raspberry Pi interface based on SIM800 quad-band GSM/GPRS/BT module SIM800 GSM GPRS Add-on V2.0 Module Shield based on SIM800 for Raspberry PI AT commands can be sent via the serial port on Raspberry Pi, thus functions such as dialing and answering calls, sending and receiving messages and surfing on line can be realized Moreover, the module supports powering-on and resetting via software