The documents also make clear just how easy it is to execute a bulk surveillance regime from the trunk of a car: A Gemini “Quick Start Guide,” which runs to 54 pages, contains an entire chapter on logging, which “enables the user to listen and log over the air messages that are being transmitted between the Base Transceiver Station (BTS) and the Mobile Subscriber (MS).” It’s not clear exactly what sort of metadata or content would be captured in such logging. The “user” here, of course, is a police officer.
“While this device is being discussed in the context of U.S. law enforcement,” said Tynan, “this could be used by foreign agents against the U.S. public and administration. It is no longer acceptable for our phones and mobile networks to be exploited in such an invasive and indiscriminate way.”