How to explain to your mother when you secretly use your cell phone when you are at school?

You should still be a middle school student. If your cell phone is secretly brought to school as you said, take the initiative to tell your mother that no matter what the reason is, you should not use your cell phone to go to school. After all, it will distract you. Can't concentrate on studying. After you get home, have a good communication with your mother. Your parents are not unreasonable, so don't be burdened. As long as you don't make the same mistake again next time, everyone makes mistakes sometimes. If you know your mistakes and can correct them, there is nothing better.