gsm-gprs
There are 3 repositories under gsm-gprs topic.
portisk8/A9G
This is a common library who use AT commands to do anything. eg: call, send SMS message, connect to MQTT broker, and use GPS..
nthnn/SIM900
A much more comprehensive library for Arduino SIM900 shield.
eta-sys/1mul
A try to write an universal language to all the micro devices