A Cellular Attack On Package Tracking

For package-delivery companies, keeping track of when and where a package is delivered is crucial. Federal Express Corp., for example, uses a private radio network linked to its trucks to monitor deliveries as they happen. At rival United Parcel Service Inc., drivers have used handheld devices that read a bar code on packages as they are delivered and capture an electronic version of customers' signatures. But the drivers still had to wait until they returned to their depot at the end of the day to send that information to UPS computers.

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