The phones are available in the UK, Singapore, Puerto Rico, Japan, Hong Kong, Germany, France, Canada, Australia and the USA – and will be sold in 20 more countries on September 26th.
Cook said that while there are supply constraints on the iPhone 6, the launch is Apple’s best ever.
The phones uses Apple’s A8 chip which is a 64 bit microprocessor, touch app Apple Pay and 4.7-inch and 5.5-inch retina HD displays.
The phones also come with an upgrade to the operating system, iOS 8, which offers new features including predictive typing and a Health app.
Apple is using its familiar trick of charging quite a bit extra depending on the memory. In the US, for example the magic figure is a $100 hike between the 16GB, 64GB and 128GB models.