The document discusses the US smartphone market. It provides a brief history of smartphones and covers major players like Apple, Samsung, and Android. Apple currently has the largest market share in the US at 30% while Samsung has 24%. Competition is based on factors like price, features, and operating system. The major operating systems are iOS, Android, Windows Phone, Blackberry OS, and Symbian. Android has seen a rise in market share globally while iOS remains strong in the US. The market is rapidly changing with new products and pricing.