I fly rotary and fixed wing and all our aircraft have Sat Phones, normally used for calling ops and the boss's PA and driver. One of the best moments of my flying life was telling one of Heathrow Director and Talk Down Man's ex colleagues "standby, I'm on the landline." 125.625 waiting for a Brent clearance to EGLW.
I called Mumbai for a clearance when I couldn't get through on HF and the controller refused to issue it as "it has to be given via HF, not over the phone."
Mid 1990's calling the office from 500 miles west of Bristol (trying for an HF patch) I couldn't get Portishead, but got a relay from a Speedbird over Alice Springs!
SND