The mobile magic box handled by my friend with my mobile phone number will deduct my phone bill every month. How to cancel it?

Mobile services handled with your own ID number, well, you can use your ID card to cancel in the business hall, and when moving or involving bank accounts, don't lend anything related to your ID card to your friends casually, because all problems are your responsibility. It's like a car. If something goes wrong, the owner is responsible.