At a new manufacturing plant outside San Diego, round-the-clock shifts fill pallets with wireless phones ready to ship to Sprint and other providers. The products in question are thin circuit boards destined for the next generation of handheld devices to access the Internet. Each circuit board inside this Denso International plant reveals why handhelds have become wildly popular: They blend humans and machines perhaps better than any prior invention. Analog chips, which render emotionally toned voice, share the board with digital signal-processing chips that are brilliant at manipulating data. Natural human communication and data-it's a compact and capable combination that is ready to fuel the next stage of network development: the mobile Internet.

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