Netbooks--super-small notebooks designed primarily for Web surfing, e-mail, and light applications--are all the rage these days. But as portable as they are, they depend primarily on Wi-Fi for wireless Internet access--and Wi-Fi hotspots aren't as ubiquitous as cell phone networks.
Powered down, Celio's Redfly devices look sort of like netbooks. But they are actually terminals for Windows Mobile handsets that you hook up via either Bluetooth or a USB cable. Without the smartphone, they do nothing; with it, though, they let you do almost anything you'd do on your handset, but with a larger display and keyboard.
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