Recommended · for some experience
#69 M2M: TCP/IP to the Cloud over GPRS with the new A6 Module and info about the new A7 Module
Why people recommend it
Andreas Spiess walks through the cheap A6 GSM module, recommended for getting it powered, reset and talking over AT commands from an Arduino.
Watch for: Needs a SIM card; the A7 sibling adds GPS
In their words
In this Andreas Spiess' video (minute 2:21), he recommends reset the device to give to the board a defined state.
cpinamtz on arduino.stackexchange.com, Jan 2017. CC BY-SA.