Apple on Monday announced that the company has sold over four million iPhone 4S in just three days after its launch on October 14. This has been the best launch weekend in the history of Apple.

iPhone 4S didn’t introduce a larger screen or new design however, on the inside it packs in more power, 8 megapixel camera with advanced optics and all-new personal assistant called Siri.  We recently reported that AT&T and Sprint had already announced that iPhone 4S was off to a great start and Apple also confirmed that it managed to sell more than one million units in first 24 hours of the pre-orders.

It’s worth noting that the new iPhone 4S is available in just 7 countries as of today which include US, Australia, Canada, France, Germany, Japan and the UK. Apple will make the new phone available in 22 more countries on October 28 and is expected to add another 70 countries by the end of the year.

iPhone 4S will be available on October 28 in Austria, Belgium, Czech Republic, Denmark, Estonia, Finland, Hungary, Ireland, Italy, Latvia, Liechtenstein, Lithuania, Luxembourg, Mexico, Netherlands, Norway, Singapore, Slovakia, Slovenia, Spain, Sweden and Switzerland.

Apple’s senior vice president of Worldwide Product Marketing, Philip Schiller, in a press release said, “iPhone 4S is off to a great start with more than four million sold in its first weekend—the most ever for a phone and more than double the iPhone 4 launch during its first three days,”.

In addition to announcing the sales figures for iPhone 4S Apple also confirmed that more than 25 million customers have already upgraded their iOS devices to run iOS 5. Apple’s new cloud services called iCloud is also witnessing a great start with over 20 million customers now using the new service.

{via Apple}