Here are the following LED status indicators for the Iridium GO!
Flashing Green = Unit is ON and registered to the Iridium network
Flashing Red = Unit is ON and not registered to the Iridium network
Red = Iridium GO! is powering on
Alternating red and green = Call in progress; ringing, dialing or in a call
Slowly flashing red = SOS has been triggered
Not lit = Device is powered off