http://www.apple.com/iphone/usingiphone/guidedtour.html

iPhone is a revolutionary new mobile phone that allows you to make a call by simply tapping a name or number in your address book, a favorites list, or a call log. It also automatically syncs all your contacts from a PC, Mac, or Internet service. And it lets you select and listen to voicemail messages in whatever order you want — just like email.
iPhone is a widescreen iPod with touch controls that lets you enjoy your content — including music, audiobooks, videos, TV shows, and movies — on a beautiful 3.5-inch widescreen display. It also lets you sync your content from the iTunes library on your PC or Mac. And then you can access it all with just the touch of a finger.
iPhone features a rich HTML email client and Safari — the most advanced web browser ever on a portable device — which automatically syncs bookmarks from your PC or Mac. Safari also includes built-in Google and Yahoo! search. iPhone is fully multi-tasking, so you can read a web page while downloading your email in the background over Wi-Fi or EDGE.

Smartphones Comparison