The New York Times has a massive piece on Steve Jobs, again. If you read beyond the usual stuff, and hype about IPod, you come to the real nugget of information at the bottom of the story.
bq. Last year, the company quietly added two new wireless standards, known as 3GPP and 3GPP2, to its QuickTime software for sending and receiving multimedia over digital cellular networks. Because Apple was an early leader in the Wi-Fi market with its airport wireless networking base station, the reasoning goes, the company may be hard at work on a line of digital mobile phones that would take the company into the fast-growing voice-over-Internet-protocol, or VoIP market. But if that is Apple’s strategy, Mr. Jobs isn’t saying.
Additional Reading: Incredible Importance of Instant Message Clients