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Motorola and NEC are co developing a WiFi cellphone:
When used inside an office, the phones tap into a Wi-Fi wireless network to make calls that travel, in part, over the Web rather than over a telephone network. Outside the Wi-Fi network's 300-foot range, the handsets switch calls automatically to a cellular network, which offers the same data features and voice calling, but at much slower speeds.This is a must have feature for my dream mobile device (although I don't care as much about voice - I just want the data connection to use WiFi if possible, but then fall back on some cellular data connection (like GRPS) if there is no WiFi network available.)
I'm at the beach for a couple of days. And my phone doesn't have service (is that a bug or a feature in terms of being on vacation?) Email me here if you need to communicate.