Smartphones are mobile phones with advanced computing capabilities and connectivity beyond basic phones. They run operating systems like Android, iOS, Symbian, BlackBerry OS, Bada, and Windows Phone. Smartphones have become hugely popular, with around half of US mobile users owning one in 2012. The top smartphones are the Apple iPhone 5, Samsung Galaxy Note 2, Nokia Palm OS, Droid Razr Maxx HD, and BlackBerry Z10. Smartphones offer a wide variety of apps that help with business, entertainment, navigation and more tasks. The Apple App Store generates the most revenue from apps.