Apple reported a net profit of US$5.99 billion for the quarter, growing from the $3.07 billion profit reported a year earlier. The company reported earnings per share of $6.40.

The company reported revenue of $24.67 billion, compared with $13.50 billion in the year-earlier quarter. Analysts polled by Thomson Reuters had expected revenue of $23.38 billion for the second quarter.

"With quarterly revenue growth of 83 percent and profit growth of 95 percent, we're firing on all cylinders," said Steve Jobs, Apple's CEO, in a statement. "We will continue to innovate on all fronts throughout the remainder of the year."

AT&T was the exclusive seller of the iPhone in the U.S. until this quarter, when Verizon Wireless also started selling the device. Apple shipped 18.65 million iPhones during the quarter, up 113 percent from a year earlier.

In addition, Apple began shipping the iPad 2 in the U.S. on March 11, and in 25 other countries on March 25. Apple shipped 4.69 million iPads during the quarter, compared with 7.33 million iPads sold in the previous quarter. The first iPad went on sale in April of last year.