How can I stop my father from taking my mobile phone away?

First of all, you are still young and a student, and your mobile phone has seriously affected your study. Yes, first give the phone to dad, then reach an agreement, such as how many points you will get in the exam next month and how much you will rank, and then get the phone back. Then keep it before how much you can keep your mobile phone. If you go backwards in the future, return the phone. Don't look at how happy you are playing with your mobile phone in front of you, look at the future. Although it is hard to study hard at the cold window, no one will care about you when you grow up. The premise is that you have the ability to feed yourself. Dad is also well-intentioned, which is a sign of loving you.