Apple just stated in their earnings call that out of 1.4 million iPhones sold since launch, 250,000 are unlocked. They know this from subtracting the number of iPhones activated on AT&T from the number of iPhones sold total—which is 250k. That's a farmhouse load of unlocked phones, which match up with the 500,000 downloads of AnySIM 1.0 unlocker we've seen before. Those are official numbers from the iPhone Dev Team, which make sense when you factor in lookeyloos who download it and people who unlock even with an active AT&T plan. [9to5Mac]
Keep in mind the high number of 'geeks' that have purchased the iPhone. It is a safe bet that at least 400K of the 1.4m phones sold were to geeks, and is it a surprise that 250K of them unlocked their phones? The percentage is going to fall as the phone goes more mainstream, of course. That said, the question is whether AT&T will push Apple to take more drastic steps to keep the phone locked? Or, another question.. Will Apple do it without any pressure from AT&T since Apple loses a couple hundred bucks on each phone that is not signed up with the death star?