iphone 4 - News, Features, and Slideshows

Worldwide mobile phone sales totaled 1.75 billion units in 2012, a 1.7 per cent decline from 2011 earlier despite record smartphone sales in the fourth quarter last year, according to Gartner.

Who knew Apple's iOS 5 mobile operating system held so many secrets? Developers and sleuthing hackers have been hard at work since Apple released the OS in October unearthing a number of hidden features and tweaking the OS to do things it was never intended to do.

A California district attorney's office has decided not to press charges against either Gizmodo or former Gizmodo editor Jason Chen for purchasing an iPhone 4 prototype in March 2010 and exposing it to the world.

The latest global market-share estimates for smartphones are out. And as we've come to expect from these regular exercises in mobile OS number-crunching, the news is bright for Apple and Google, but a bit bleak for Nokia, Research In Motion (RIM), and Microsoft.

OK, so Ubuntu Linux is all installed and ready to go. Now what?

Images and details of the BlackBerry Dakota--the impending flagship smartphone from Research In Motion (RIM)--have emerged. The Dakota is packed with features as RIM struggles desperately to regain lost ground and compete with the Apple iPhone and the rising Android invasion.

Facebook is getting serious about on-the-go social networking with a suite of new features announced during the Facebook Mobile event on Wednesday.

The Apple iOS, which runs on its iPhone, iPod Touch, and iPad, has a flaw in how it reads PDF documents that makes it easier to hack. This flaw is exploited by JailbreakMe, a one-click site that makes it easy for anyone without any real tech skills to hack into their own iPhone.