T-Mobile

"The option to opt-out is an ‘off-on’ button that is incredibly unclear (does ‘off’ mean that they will NOT sell my information? or that the opt-out if ‘off’, meaning they WILL sell my information?)."

"Section: “Do not sell my personal information:” Option: “on this website” Options: “on/off” Most sites ask: “we want to do x: do you want us to do this?” This site asks: “we want to do x: do you not want us to do this?” Adding the negative is unexpected, and preys on the assumptions built up from from other sites."

Data sales begin April 26 unless you opt out; T-Mobile claims it'll be anonymous.

The program collects information about the apps you have installed on your phone, how often you use them, which Wi-Fi networks you connect to and your web browsing habits and then sells that valuable information to marketers.