The iPhone 4 went on sale on Thursday in the US, Britain, France, Germany and Japan. High demand for the model caused shortages and unruly crowds at some stores.
“This is the most successful product launch in Apple’s history,” said Steve Jobs, Apple’s chief executive. “Even so, we apologize to those customers who were turned away because we did not have enough supply.”
Some stores sold out in hours. Analysts have said Apple is having a hard time procuring enough parts for the phone, such as its new higher-resolution screen. Apple has said the white iPhone it plans to produce has been more challenging than expected and will not be available until late July.
Only black models went on sale last week.
Apple sold more than a million units in the first three days when it launched last year’s model, the 3GS. Canada, Italy, Spain and Switzerland were then among the launch countries, but Japan was not.
Apart from the sharper screen, the iPhone 4 features a slimmer body and faster processor than the previous model, among other changes.