Basics project 085f Ai Thinker A6 GSM GPRS module - GPRS application and GSM initialization - Acoptex.Com
A9G pudding – GRPS, GPS and microcontroller all in one! - Twigg-o-tronix
Maduino GPRS GPS A7 | Makerfabs
Elecrow ESP8266 ESP 12S A9G GSM GPRS+GPS IOT Node V1.0 Module IOT Development Board with All in one WiFi Cellular GPS tracking|Integrated Circuits| - AliExpress