Apple announced on June 28, 2010 that it sold more than 1.7 million units of the new iPhone 4 within the first three days of its launch.
That makes it the most successful product launch in the company's history from the standpoint of sales. Apple sold more than 1 million units in the first three days when it launched last year's model, the 3GS.
The iPhone 4 went on sale Thursday in the U.S., Britain, France, Germany and Japan. High demand for the model caused widespread shortages and there were also reports of some unruly crowds at some retail stores.
"This is the most successful product launch in Apple's history," said Steve Jobs, Apple's CEO. "Even so, we apologize to those customers who were turned away because we did not have enough supply."
Analysts have said Apple is having a hard time procuring enough parts for the phone, such as its new higher-resolution screen. Apple also announced its white iPhone it plans to produce has been more challenging than expected and won't be available until late July. Only black models went on sale Thursday.
Apart from the sharper screen, the iPhone 4 features a slimmer body and faster processor than the previous model, among other changes.