A9G GSM/GPRS+GPS Modules is a quad-band GSM/GPRS module based on RDA8955 SoC and comes with 29 GPIOs and an integrated SDK. These modules support the basic phone voice call/SMS, serial to GPRS, and GPS data transmission functions which can be used in a wide range of applications. The A9G modules allow users to make a voice call, use SMS services, and access the internet and base position with only a 2G SIM card. These modules operate at -20°C to 70°C temperature range. Applications include IoT, vehicle-mounted equipment, remote localization, and electric power environment monitoring.