16. Will iPhone's single-carrier model wreck the product for most users? Some U.S. cities don't have any Cingular coverage. In other cities, such as New York, Cingular coverage is inferior to competitors' coverage. By limiting the iPhone to Cingular only, will Apple turn away the majority of its potential iPhone customers?

17. Will there be any way to wirelessly share files with the iPhone? Like the Microsoft Zune, the iPhone supports Wi-Fi. But unlike Zune, iPhone Wi-Fi is for connecting to the Internet through wireless hotspots or networks only. You won't be able to connect peer-to-peer. Will Apple be able to turn on this capability later? Will the company at least enable file sharing over the Internet?

18. Will the iPhone kill sales of iPods? Apple has a good thing going with its profitable iPod business. But will people stop buying iPods as they wait for an iPhone? Will investors conclude that Jobs' keynote was a big mistake if iPod profits go down the drain for two quarters?

19. Will Apple be able to accurately fill iPhone orders? No doubt the iPhone is very expensive to manufacture, and, unlike the iPod, is a very complex device, electronically. In the first year of its release, Apple could very easily overbuild -- build far more than it can sell in a given period of time -- or under build -- be unable to keep up with demand, and create long waits and frustrated customers.

20. Will the iPhone really "change the world"? The iPod "changed the world" because everyone bought one. But will the iPhone's price, Cingular-only support, lack of business usability and other factors really make the iPhone just a niche luxury toy for the rich?