More - DFRobot TEL0097 Manual

If you are going to use SIM808 GPS/GPRS/GSM Shield with a Leonardo board, it will be more like a SIM808 GPS/GPRS/GSM mainboard
. You can check its wiki for the
user manual.

More

SIM808 GPS/GPRS/GSM Shield schematic
(https://github.com/Arduinolibrary/DFRobot_GPS_GPRS_GSM_shield/raw/master/TEL0097%20SIM808%20%20GPSGPRSGSM%20Shield(V1.0)%E5%8E%9F%E7%90% 86%E5%
NEW SIM800 Series GNSS Application Note V1.00
(https://github.com/leffhub/DFRobotSIM808_Leonardo_mainboard/raw/master/Documents/NEW%20SIM800%20Series_GNSS_Application%20Note%20V1.00.pdf)
SIM800 Series AT Command Manual V1.07
(https://github.com/leffhub/DFRobotSIM808_Leonardo_mainboard/blob/master/SIM800_Series_AT_Command_Manual_V1.07.pdf)
SIM808 Hardware Design_V1.00
(https://github.com/leffhub/DFRobotSIM808_Leonardo_mainboard/raw/master/Documents/SIM808_Hardware%20Design_V1.00.pdf)
SVG file (https://github.com/Arduinolibrary/DFRobot_GPS_GPRS_GSM_shield/raw/master/TEL0097_EN.svg)