after start-up, asking for PIN
PIN accepted, waiting for GSM network
Registered into GSM network, indicating signal strength (S) and battery state (B) and network name. Battery state is irrelevant, as it is supplied by external source, not battery :-)
Entering phone number through keypad...
Calling back to my device - showing incoming call, with option to accept call.
Call accepted, with option to end call.
Back side, GSM module removed