What exactly do you mean by 'upgraded infotainment'??
I believe for 2018 i3 CarPlay was an add-on option that had to be chosen/specified when the car was built. You can check your car's included options by inputting your VIN in one of the free BMW VIN check sites.
2015 i3 Rex, Capparis White, Tera World, Technology & Driving Assistant, Parking Assistant, Harman Kardon Audio System, 19 inch 427 wheels, EVoInnovate EVSE