content: By default, sure. With a bit of effort, you can reduce the data leaks to  tapped phone convos (not new) SMS logs (new?, scary) rough geolocation (new, scary?) mobile data (your ISP at home can do this as much as your Cell provider. Not new.)  That's the price to be paid, though, for a device in your pocket that allows you to send messages, have audio conversations, and connect to the Internet wherever you go. Not really a way to have it any other way. Don't like it? You're not required to purchase a cell phone.