Turn off the slogan of the dangers of mobile phones.

1. Affect the concentration of the owner in class. You should always think about playing with your mobile phone in your pocket.

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

3. Mobile phones are valuable and easy to lose.

4. It will make people feel competitive (if you have a mobile phone and I have a mobile phone, I will compare whose mobile phone is better, right? )

5, the mobile phone has radiation.