It's a badly kept secret that law enforcement uses fake cell phone towers, called stingrays, that can track phones and eavesdrop on communications. But one research team has taken it upon themselves to sniff them out -- and at a reasonable cost, reports Wired.
A group of Seattle-based researchers paid fifteen different rideshare service drivers $25 a week each for two months to drive around with a custom-made device in the back of their car. Called SeaGlass, it had a Raspberry Pi computer, a hotspot, an Android phone, a GPS module and a GSM modem. All totaled, each suitcase-sized box had about $500 worth of equipment inside. The team's mission was to map every cell tower that connected to both the modem and Android phone while the cars were driving through the city.