This is bit of a cheat because there have been 8 versions of the iPhone but it still makes you think a bit…
“Car model: VW Beetle 21.5 million
Car brand: Toyota Corolla 43 million
Music Album: Thriller 70 million
Vehicle: Honda Super Cub 87 million
Book Title: Lord of the Rings 150 million
Toy: Rubik’s Cube 350 million
Game console: Playstation 382 million
Book series: Harry Potter Series 450 million
Mobile Phone: iPhone 1 billion”