Turn off your cell phone. It's dangerous.

1. Affect the host's concentration in class. You always want to play with your mobile phone in your pocket.

2. Mobile phones are not commonly used in schools below the university level, and bringing them into the campus will disturb others (because others don't have mobile phones, they will inevitably be curious about your mobile phone, which will cause a lot of trouble).

Mobile phone is a valuable thing, and it is easy to lose.

4。 Will make people feel competitive (if you have a mobile phone and I have a mobile phone, whose mobile phone will I compare, right? )

5, mobile phones have radiation