Apple has expanded the iPhone's capabilities with a software update that adds a location finder to the Maps feature, customised home screens, multi-person SMS chats, and Webclips. In addition, video playback on the phone now supports chapters, subtitles and languages, while the music playback adds support for lyrics.
Apple CEO Steve Jobs unveiled the latest iPhone features during his Macworld Expo keynote.
The Maps interface has been streamlined in the latest update, adding a button in the bottom left that finds your location on a map. Apple worked with Google and Skyhook Wireless to use wi-fi hotspots to create the location feature.
"The iPhone is not standing still," Jobs said.
According to Jobs, Apple has sold four million iPhones to date, averaging sales of 20,000 phones per day. That gives the iPhone a 19.5-percent market share of the U.S. smartphone market, second only to BlackBerry maker RIM, which has a 39 percent market share.
What's more, Jobs said, the iPhone's market share is equal to the combined percentage of the next three largest companies -- Palm, Motorola, and Nokia.
Macworld will post more information on the iPhone software update as it becomes available.