I have had sat on my desk for a while the Arduino(.org) GSM Shield 2 (R3)for a while; I have just got round to playing with it; however...
Using it with an Arduino Uno and Arduino IDE v. 1.8.5 on Windows 10, the supplied 'TestGPRS' script in the examples menu does not operate as intended. the messages returend via the serial console are:
"Starting modem test...ERROR, no modem answer.
Checking IMEI...Modem's IMEI: 0
Resetting modem...Modem is functoning properly