Phones can collect your data
Most things you do on your phone these days create a lot of useful data which can be shared with companies providing the services.
If you pay for something by charging the cost to your phone bill or phone credit, the company involved has to ensure they don’t invade your privacy.
For example, you shouldn’t be contacted unless you have agreed to it and they shouldn’t collect information from you that you don’t agree to.
They also shouldn’t pass on your details to anyone else, unless it’s to offer you a refund.