Apple Inc. said Monday it has sold 1 million iPhones in the three days following the release of the latest model on Friday.

“IPhone 3G had a stunning opening weekend,” said Steve Jobs, Apple’s chief executive, in a statement.

But the launch was plagued by software problems. All the new iPhones had to connect to Apple’s servers for activation, which quickly overloaded them. Lines of customers built in stores as employees were unable to get the phones working.

Additionally, new software was released for the old iPhone, which required reactivation of those phones. Many owners of the older phone were left with unusable units.