I’m not sure how much is recorded. As I understand it, the pax-pilot didn’t want to mess with the glass cockpit to change to a better radio frequency for fear he’d lose all communication.
So the CFI called him on his cell-phone.
I don’t think that conversation was recorded. But the inherent duplex nature of cell-phone communication versus simplex comm radios means the CFI and pax-pilot could communicate more easily and rapidly. This probably contributed to the successful outcome.