The ultimate hacker phone, the Nokia N900 is the truest expression of Linux—the OS and the philosophy—that you'll find on mobile this year. It's a great niche gadget. But the idea that free, open-source solutions will sweep the mobile world is just as doomed in the U.S ... T-Mobile could start stocking unsubsidized N900s to show a different way of thinking from the other major carriers. The carrier could flirt with the geeks to boost its profile, attracting developers and creative types. Maybe this would give the number four carrier a leg up. Geeks may finally find their wireless carrier after all.