Which occasions need to be turned off?

1. Using the mobile phone on the plane may interfere with the communication network of the plane and endanger the safety of the plane. Please turn off your mobile phone before boarding. 2. In gas stations, chemical plants, oil depots and blasting sites, it is recommended to turn off the automobile engine in any area. Please turn off your mobile phone. 3. Please turn off the mobile phone in the medical place where it is forbidden to use it. 4. When using a mobile phone, don't get close to people who use pacemakers or hearing AIDS. Please use your mobile phone carefully when driving, so as not to affect traffic safety.