Even if you’ve done nothing wrong, the government may be tricking your cellphone into divulging your movements, while seeing who you’ve texted and called. Since 1995, local and state governments, as well as federal agencies, have been using “cell site simulators,” commonly known by the genericized brand name “stingrays.” These portable devices collect data from the cellphones of anyone who happens to walk into range of its signals. Stingrays work by mimicking cellphone towers, sending signals to trick phones in a targeted area into transmitting the locations and identifying information from bystanders. Stingrays represent one of the largest bulk data collection programs in the United States, operating at all levels of government.