I just go "Do Not Disturb" mode on an iPhone or iPad. It will silence calls and notifications while keeping your cellular available for maps and gps. So they say...lol
Hasn't failed me yet so far. I do turn off wi-fi and bluetooth also.
Cellular can interfere with the controller to drone link, depends on the drone. makes a big difference with my Parrot Anafi, I get up to 50% more range in Airplane mode...wifi and bluetooth always off.