The new iPhone 4S, which comes with 16, 32 or 64GB of storage, will be released in seven countries, including Britain, on October 14th.
The new handset looks the same as the iPhone 4 but contains considerable upgrades to its components.
Phil Schiller, Apple's vice president of product marketing, introduced the new iPhone 4S saying: "Don't be deceived because inside it is all new."
The iPhone 4S runs on the same A5 processor that powers the iPad 2 and has an improved camera. It offers 8-megapixels, compared with the iPhone 4's 5-megapixels and, Apple says, will deliver sharper pictures with better colours.
Launched in 2007, the iPhone is now Apple's most successful product. More than 20 million iPhones were sold in the second quarter of this year, despite the growing likelihood of a new model.
