The Street sees trouble here for the cellular tower companies, and for obvious reason: it would mean one less company looking for places to add infrastructure.

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Skyhook has amassed a database of 50 billion scanned records of Wi-Fi, cellular tower and GPS signals--a "map" of locations that captures 80% of the U.S. population.

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When it comes time to send them off to another destination, he goes back to his Palm VII and a cellular tower detects his location and directs him to the nearest dropoff.

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During a call the service monitors how fast data are going through the air and adjusts call quality so the video doesn't cut off when a network's load changes or someone roams to a new cellular tower.

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He invested in a cellular-tower company in Nigeria and stocks in the Harare bourse through Imara Securities, a Botswana firm he owns a piece of, but he avoids South Africa in part because of the laws requiring local partners.

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At the time cellular calls flitted from tower to tower under an electronic protocol later known as GSM (global system for mobile), a group effort whose three progenitors--Nokia, Ericsson and Motorola--had pooled their patents and didn't charge one another any royalties.

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Even if you're calling someone next door, the cellular signal must first travel to the local cell tower before being routed to your neighbor's phone.

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