There's no minimum service, customers are allowed to change their plans onthefly, and there's even a handy parental control mode that lets concerned caretakers set curfews and app restrictions on their kid's phones.
You can also paint colors or textures right onto surfaces, and everything's rendered in realistically shaded 3D onthefly, so there's no guesswork about how your creations will look.
Each time, she kept the printout of his flight information behind a magnet onthe door of the refrigerator, and onthe days he was scheduled to fly she watched the news, to make sure there hadn't been a plane crash anywhere in the world.