The U.S. National Security Agency (NSA) has been monitoring cell towers across the globe.
The NSA’s Global Engagement Team is tasked with collecting intelligence and is capable of collecting signals intelligence (SIGINT) on millions of mobile phones.
One of its capabilities is the ability to detect the locations of mobile phone towers.
However, the technology has been used to gather a wealth of other data.
This article looks at how the NSA has used GPS data to map a cell tower, what the agency is doing with that data and how to spot a potential tower.