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Harware that can straddle wireless LANs and cellular networks

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This story appears in the December 2004 issue of Entrepreneur. Subscribe »

The dream is a world where phones and other seamlessly hand off your calls according to the availability and speeds of different networks. Integration of services like VoIP will not only create more flexible work environments, but could also save you money by transferring calls to the least-cost network.

Making this a reality requires cooperation between cellular service providers, software developers and hardware manufacturers. The first hybrid device debuted this fall, focusing on data rather than voice services. , with T-Mobile, recently brought out the $499 (street price with activation) iPAQ h6315 Pocket PC. Stocked with , a removable keyboard and an optional camera, it can hop from a cellular network to faster for data transfer when available.

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