From Fiercewireless...

What was interesting about Apple's earnings call was the iPhone. While the company is keeping mum on how much money they drew out of iPhone sales, they did own up to selling 1,119,000 phones in Q4 2007, bringing the total number of iPhones up to 1,389,000. By comparing the number of iPhones sold to the number of iPhones activated on AT&T's network, Apple was able to figure out how many unlocked devices exist in the wild: somewhere in the neighborhood of 250,000. That's a huge number--representing almost 17 percent of all iPhones sold--and demonstrates that there's a very real demand for an unlocked iPhone.