Apple sold 1 million iPhones in the first three days its newest model was on the market, an Associated Press report said.
'IPhone 3G had a stunning opening weekend,' Steve Jobs, Apple's CEO, quoted by the report, said.
However, Jobs did not address widespread software problems that plagued the launch.
On Friday, Apple's servers buckled as buyers tried to activate new iPhones in stores, while owners of older iPhones and the iPod Touch were updating and reactivating their devices, the report said.
In stores, employees who couldn't get the new iPhones working sent shoppers home to try again on their own later. At the same time, owners of the older phones were left with unusable units.
Reports of activation snags subsided over the weekend, as Apple's systems apparently recovered, and buyers were able to activate their phones through their home computers.
The Associated Press report further said as of Monday, the issues appeared to have been resolved, according to analyst Charles Golvin of Forrester Research.
Apple did not respond to calls or e-mails requesting more information about the activation glitches.
Apple had sold about 6 million units of the first-model iPhone since it launched in the US a year ago. The company has set a goal of selling 10 million iPhones by the end of 2008.