GSM/GPRS/GPS Shield (B), Arduino Shield Based on SIM808 

SIM808 GPS/GPRS/GSM arduino shield is an integrated quad-band GSM/GPRS and GPS navigation technology Arduino expansion shields. A credit card size only, according to the standard Arduino pin packaging, compatible with Arduino UNO, arduino Leonardo, arduino Mega and other arduino mainboard.
Compared to the previous generation SIM908, SIM808 made some improvement on the performance and stability. In addition to the normal SMS and phone functions, the shield also supports MMS, DTMF, FTP and other functions. You can achieve the data acquisition, wireless data transceiver, IoT application and GPS orientating. The should integrates onboard microphone and headphone jack, saving your cost and making your project easily. it can also directly connect to the GSM and GPS antenna by an external antenna connector.
SIM808 GPS/GPRS/GSM Arduino Shield V1.0 uses the latest version of Simcom SIM808 module, compared with the early SIM808 module available in the market, the new module has better stability. But GPS part of AT commands are not compatible with the old version of the SIM808 module, please refer to the bottom of the "more" in the AT commands.

Hardware description:
    SIM808 module
    MIC29302 power chip
    CP2102: USB TO UART converter
    SMF05C: TVS diode
    1N5408: onboard rectifier
    SIM808 functional pins
    Arduino expansion connector
    USB TO UART interface
    DC power jack
    GPS antenna connector
    Bluetooth antenna connector
    Firmware upgrade interface
    GSM antenna connector
    SIM card slot
    3.5mm earphone/mic jack
    GPS status indicator
    CP2102 UART Tx/Rx indicator
    NET indicator:
        flashes fast when the module starts up 
        flashes slowly after GSM register succeed 

    Power indicator:
    Power switch
    SIM808 control button: press the button and hold for 1s, to startup/shutdown the SIM808
    Reset button
    UART selection switch, select controlling the SIM808 via:
        CP2102 
        UART pins of Arduino interface 

    SIM808 UART configuration:
        SIM_TX: SIM808 UART TX 
        SIM_RX: SIM808 UART RX 

    IOREF power selection: configure the UART voltage level

For More Details on PC Click here

For More Details on Portables Click here.