Apple today announced it has sold over four million of its new iPhone 4S, just three days after its launch on October 14. In addition, more than 25 million customers are already using iOS 5, the world’s most advanced mobile operating system, in the first five days of its release, and more than 20 million customers have signed up for iCloud, a breakthrough set of free cloud services that automatically and wirelessly store your content in iCloud and push it to all your devices. iPhone 4S is available today in the US, Australia, Canada, France, Germany, Japan and the UK, and will be available in 22 more countries on October 28 and more than 70 countries by the end of the year.

Impressive for the iPhone 4S and iOS 5.