Between Windows Mobile 2003(SE) and Windows Mobile 5.0, Microsoft attempted to make the Pocket PC and Smartphone platforms similar.
One way they did this, was to make Pocket PC devices more single-hand friendly. Their ODM-buddy HTC jumped on by putting more of the important buttons like (Start and OK) at the bottom of the device and a ‘jog-wheel’ where the index finger (for right-handed people at least) goes. This allows you to do a lot with just your right thumb, and scrolling with your index finger.
Almost everyone using a WM Smart Phone or other ‘Smart Phone’ (e.g. a Nokia running Symbian) is very used to the idea of ‘thumbing’ away of their keyboards. Even the Pocket PC devices with slide out keyboards, and the UMPCs coming out now with keyboard, really rely on good ‘thumbing’ skills for typing…
Along comes the Apple iPhone and the HTC Touch. Both of these heavily demonstrate the use of the index finger for controlling the interface, which essentially makes using the device an involved and more distracting experience because it becomes a two-handed (or stable-surface-dependent) experience. Follow that Apple link – it takes one hand just to hold the thing – great if it’s a Star Trek Tricorder, but not so great if you want to live in the modern world. Did I mention (as you probably already know) that both of these devices are missing 3G radios?
So forget the wow with these two new devices for a second and consider just how potentially inconvenient they are to use on the go!