Matt BlazeAs I've noted elsewhere, one-way pagers (at least the kind that don't explode) are actually a pretty good way for a covert organization to communicate with its members. Unlike cellphones, which are constantly registering with a local tower, pagers don't expose the locations of recipients to the infrastructure or to eavesdroppers. They work by "flooding" - broadcasting all messages over the entire service area, leaving it to the devices to filter out the messages addressed to them.
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