When it comes to your privacy, your mobile carrier is not the place to look for a secure private environment. It doesn’t matter how you connect to the internet, the mobile carriers are truly the man in the middle. When we sign up for a new phone, we authorize the carrier to take what information we generate on our mobile devices and allow them to use that information in marketing side of their business. All of this is clearly written in your service contract if anyone bothers to read it.
There is very little we can do about this, other than to manage what information you generate on your mobile devices.