This may have been asked and answered before, and if so I am sorry for the duplicate question.
I saw someone mention that Volvo on Call operates with its own sim card. Separate to the removable one in the glove compartment. Is this true? And if true, does it run whether or not the vehicle is set to 3g or Wifi? Meaning, I no longer subscribe to AT&T and have put my vehicle to use my Cell Phone Hotspot as it's data connection (Wifi). I don't always boot up the Wifi if I choose not to listen to Pandora, etc.
So the question being, does the VOC work independent of whether AT&T 3G Modem is selected as Enabled or I choose Wifi? Or if no internet connection is available (I Don't turn on Wifi), VOC will not operate on its own?