Apple has announced over one million iPhone 3GS models sold since its initial launch three days ago.

In addition, six million customers have downloaded the iPhone 3.0 OS since its full release, five days ago. Apple said its application store has already hit one billion downloads.

“Customers are voting and the iPhone is winning. With over 50,000 applications available from Apple’s revolutionary App store, iPhone momentum is stronger than ever,” said Apple founder Steve Jobs.

Apple says the new 3GS model is up to twice as fast as the previous model. Improvements included longer battery life, a better camera with video recording capacity and voice control.

Apple elaborated on the iPhone 3.0 OS improvements, including cut, copy, paste, MMS, spotlight,and a landscape keyboard.

The iPhone 3GS won’t be available to Australians until 26 June.