They already sell phones on a variety of networks, some with exclusivity which consumers understand. Give people the choice. Let me select Windows or Android

They already sell phones on a variety of networks, some with exclusivity which consumers understand. Give people the choice. Let me select Windows or Android when I boot the phone for the first time. Add in an option for a simplified granny mode. This would allow the marketing to focus on the actual hardware which is Nokia's strength and make them uniquely different to Samsung and Apple.