Apple sold a record 4 million iPhone 6 and 6 Plus units in the first 24 hours of their availability. On Monday, the company followed that announcement by saying it sold a record 10 million iPhone 6 and 6 Plus units over the opening weekend.

The iPhone 6 sales shattered the earlier record of 9 million units sold during the first weekend of availability that was set by the iPhone 5S and 5C. It also blew past sales of the iPhone 5, which amounted to 5 million units sold in the first three days after it hit stores.

“Sales for iPhone 6 and iPhone 6 Plus exceeded our expectations for the launch weekend, and we couldn’t be happier,” CEO Tim Cook said in a statement. “We would like to thank all of our customers for making this our best launch ever, shattering all previous sell-through records by a large margin.”

Cook hinted that Apple could have sold even more iPhone 6 units if the new phones hadn’t been in such short supply. It’s unknown which of the two new iPhones is more popular than the other, but analysts believe the smaller iPhone 6 is selling better, but the iPhone 6 Plus is available in more limited numbers.

In spite of obvious shortages, Apple plans to open up iPhone 6 and 6 Plus sales in 20 more countries before the week ends, including Austria, Belgium, Denmark, Finland, Ireland, Isle of Man, Italy, Liechtenstein, Luxembourg, Netherlands, New Zealand, Norway, Portugal, Qatar, Russia, Saudi Arabia, Spain, Sweden, Switzerland, Taiwan, Turkey, and the United Arab Emirates.