The phone will come with a "smart stay" feature that recognizes how a user's eyes are moving when reading an e-book or browsing the Web and will adjust the screen brightness accordingly. In a demonstration video, Samsung showed how the phone's screen will go black when a user's eyes are closed.

An "s voice" natural language user interface will allow voice control of the phone. The demonstration showed how a user can use a voice command to play a song, for example. Officials said s voice goes beyond earlier voice recognition technology from Samsung, but didn't elaborate.

Samsung said it expanded on Android Beam technology by allowing a 1GB movie file to be shared in three minutes by touching one Galaxy S III to another. Android Beam works over Near Field Communication wireless technology, but Samsung enhanced the feature with Wi-Fi Direct technology for quicker sharing, officials said.

The NFC chip in the phone also allows mobile payments, but Samsung didn't elaborate on which mobile payment app might be supported. Officials did say users will be able to make mobile payments with the phone at the Olympic Games venues in London. In the U.S., AT&T, Verizon Wireless and T-Mobile are working together in a consortium called Isis to launch this summer.

Samsung said the Galaxy S III will have a 2,100 mAh battery, bigger than many of the recent on the market. The phone has a 1.4 Ghz quad-core chip based on the ARM Cortex A9 . The phone's 16GB of internal memory can be expanded with a 32 GB microSD card, with a 64GB card available soon.