Although 1.7 million devices were sold in the first three days following the release, breaking the three million mark in just over three weeks is nothing short of stunning. To put all of this in perspective, remember that it took 74 days to sell the first million units of the original iPhone.
The iPhone 4 is shaping up to be the fastest-selling smartphone in the company's history. This is without a massive international push, as well; the iPhone 4 won't hit many of its major international markets until July 30, when it will become available in Australia, Austria, Belgium, Canada, Denmark, Finland, Hong Kong, Ireland, Italy, Luxembourg, Netherlands, Norway, New Zealand, Singapore, South Korea, Spain, Sweden and Switzerland. The full international rollout is slated for the end of September.
Check out the history of the iPhone and its sales records in this infographic.