There have been leaked prototypes with integrated cellular, FWIW: https://www.macrumors.com/2011/08/14/photos-of-a-prototype-macbook-pro-with-integrated-3g-cel

There have been leaked prototypes with integrated cellular, FWIW: https://www.macrumors.com/2011/08/14/photos-of-a-prototype-macbook-pro-with-integrated-3g-cellular-data/ https://www.macrumors.com/2011/08/14/photos-of-a-prototype-m...