I loved Nokia's Linux phones, and bought several of them. I drove to New York (from Boston) twice to get an N900 as early as possible. But I wonder what they would have had to do to make that line of phones a mass-market success. Users of the N900 had root privilege. Can you imagine a support nightmare that would have been for T-Mobile et al.? To sell Linux phones to the general public, I think they would have had to lock down the OS to the point that it resembled what Android is today.