How you can be tracked anywhere in the world
By Sohail Al-Jamea, Lazaro Gamio and Craig Timberg, Published: Aug. 24, 2014
Surveillance companies are marketing systems to governments worldwide that are capable of pulling location data out of global cellular networks, even if you are traveling in another country. These systems are designed so that neither cellphone users nor their carriers detect the tracking. That could allow government officials to potentially sidestep court review or other systems designed to protect the rights of people targeted for surveillance.
SOURCES: Security researcher Tobias Engel and marketing documents from Verint, Defentek and other makers of surveillance systems