Cell phones run a hidden operating system that is always turned on and sends pings to cell phone towers constantly, always searching for the closest or strongest signal. Cell towers keep a log of those pings. Since pings are being sent constantly between multiple towers, records allow law enforcement to triangulate a phone’s location based on the strength of the pings between towers. “So there are various different technical ways that a cell phone could be sending various messages over a short period of time, these sort of signaling messages, to multiple towers,” said Jeremy Gillula, senior staff technologist with Electronic Frontier Foundation. “That’s likely how they figured it out.”

Friday, November 11, 2016
Greenville Online