Apple sold over 1.7 million of its iPhone 4 handsets three days after it was released globally on June 24.
The iPhone 4 was made available in the UK, US, France, Germany and Japan, and will be available in a further 18 countries by the end of July.
Apple chief executive Steve Jobs said: “This is the most successful product launch in Apple’s history. Even so, we apologise to those customers who were turned away becuase we did not have enough supply.”
The device, which is Apple’s thinnest iPhone to date at 9.3mm thick, comes with a front-facing camera to introduce ‘FaceTime’ video calling between iPhone 4 users in a Wi-Fi enabled area, as well as a high-definition ‘Retina Display’ screen to offer 960×640 pixel resolution – four times that of existing iPhone models.
Other features include a five-megapixel camera with LED flash and video recording at 30 frames per second.