The iPhone 3G S comes in two models - 16GB and 32GB - and comes with Apple's new iPhone OS 3.0.

SHOWCASE: Apple has unveiled a new iPhone called the iPhone 3G S at the Worldwide Developers Conference in San Francisco today. ‘S’ in 3G S stands for ’speed’ and apparently, the 3G S is twice as fast as the iPhone 3G, thanks to its 7.2Mbps HSDPA chip. Expect the phone to hit US stores June 19.

Not only that, battery life is longer, there’s a 3-megapixel autofocus camera, voice recording and hands free voice control. The 3G S will also include the new iPhone OS 3.0, which comes with 100 new features from Cut, Copy and Paste, MMS, Spotlight Search to landscape keyboard and more.  

While the 16GB model costs US$199 and the 32GB costs US$299, US-based telecom operator AT&T will be charging consumers between US$399-699 for the iPhone 3G S. 

Apple will be giving away the iPhone OS 3.0 for free to existing iPhone owners but charge US$9.95 for iPod touch users who want to upgrade. Not only that, the existing 8GB iPhone 3G will cost just US$99 for new AT&T subscribers from June  8.

The iPhone 3G S will be made available in more than 80 countries over the coming weeks. Check out some of its other features here.

If you want to catch the press conference of the announcements, watch in Quicktime MOV format here. If you want to read up on a report of what exactly went on over there (yes, one of our own from the Singapore team was there), go here.