<P> Cellphone surveillance, also known as cellphone spying, may involve the tracking, bugging, monitoring, interception and recording of conversations and text messages on mobile phones . It also encompasses the monitoring of people's movements, which can be tracked using mobile phone signals when phones are turned on . In the United States, law enforcement agencies can legally monitor the movements of people from their mobile phone signals upon obtaining a court order to do so . Cellphone spying software is software that is surreptitiously installed on mobile phones that can enable these actions . </P> <P> StingRay devices are used by law enforcement agencies to track people's movements, and intercept and record conversations, names, phone numbers and text messages from mobile phones . Their use entails the monitoring and collection of data from all mobile phones within a target area . Law enforcement agencies in Northern California that have purchased StingRay devices include the Oakland Police Department, San Francisco Police Department, Sacramento County Sheriff's Department, San Jose Police Department and the Fremont Police Department . The Fremont Police Department's use of a StingRay device is in a partnership with the Oakland Police Department and the Alameda County District Attorney's Office . </P>

Can police tap your cell phone text messages
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