SOME CARS COME WITHOUT WIFI AERIAL.IN THIS CASE YOU HAVE TO GET ONE FROM EBAY VERY CHEAP AND SIMPLE PROCEDURE TO INSTALL.
AFTER INSTALL IF YOU DON'T SEE CARPLAY OPTION PLEASE DELETE YOUR PHONE FROM CAR AND DELETE YOUR CAR CONNECTION FROM YOUR PHONE AND LOCK YOUR CAR FOR 10 MIN. AFTER THAT PAIR EVERYTHING AGAIN AND YOU ARE READY TO GO.
SOME CARS REQUIRE WIFI ARIEL TO BE INSTALLED TO GET CARPLAY WORKING
IF YOU WANT BMW WIFI ANTENNA FOR GREAT PRICE HERE IS THE LISTING: https://www.ebay.co.uk/itm/313427990229