Edward Snowden and Andrew bunnie Huang want to create an add-on hardware component that will protect front-line journalists in repressive regimes. They say governments have demonstrated the capability to track people through their smartphones even if the devices are set to Airplane Mode on iPhones with iOS 8.2 and later, GPS remains active in Airplane Mode. They did not address in their paper whether that kind of privacy could also be irresistible to terrorists and other criminals.”]
Source: https://www.csoonline.com/article/3106261/snowden-and-huang-hope-to-help-smartphones-go-dark.html