I make my calls from home via wifi calling. I don't put it on airplane mode. As long as I'm on wifi and signed in it automatically places call via wifi so I'm not using data.
Hmmmm.....my Verizon S7 manual states calls will be made on the Verizon network and then, as a back up, wifi will be used if the signal is weak BUT the calls always drop out with the switchover so I just airplane Mode/WIFI all calls...and calls do not count against your data plan but if you have limited minutes they will count against that,,,,same with texts.
