According to waitingforiphone.com, AT&T has activated over 1 million iPhones within the first week of sales:
According to reports leaked to waitingforiphone.com, ATT Mobility has fulfilled over 1 million iPhone activations since the device was launched in the US on June 29th. This news comes from a full-time staffer in ATT Mobilty’s Commerce Group who chose to remain anonymous. Wall Street analysists have placed initial iPhone sales between 500,000 – 750,000 units. First week sales of over 1 million would cement the iPhone as Apple’s fastest selling new product, and one of the hottest new technology gadgets in history.
If this is true, I’m going to go out on a limb and say that’s probably the most successful mobile phone/smartphone launch in the history of the cell phone industry.