Apple has sold four million iPhone 4S across the world in just three days after the smartphone went on sale last Friday.
The iPhone 4S has been selling in Japan, Australia, France, the UK, Germany, Canada and the United States and will be available in more than 70 countries by the end of the year.
Apple received more than one million online orders in the first 24 hours after the release of the iPhone 4S, exceeding the 600,000 for the iPhone 4, though it was sold in fewer countries.
Unveiled just a day before Apple chairman Steve Jobs died, it was initially dubbed a disappointment, partly because it looked identical to its predecessor.
However anticipation of its "Siri" voice software has helped it set an online record in orders.
Along with the new iPhone, more than 25 million customers are using the iOS 5 mobile operating system, in the first five days of its release, and more than 20 million customers have signed up for its free cloud services, Apple said.