1. Use with caution in thunderstorms. Because due to the interference of lightning, the frequency of the phone jumps to enhance, easy to induce lightning strikes, burners and other accidents.
2. Turn off your phone when you are traveling on an airplane. Otherwise, it is likely to cause the aircraft electronic control system failure, resulting in flight control accidents. Because the aircraft's navigation system is most afraid of high-frequency interference.
3. In hospitals with electronic medical equipment, treatment rooms, operating rooms, laboratories, etc., static use of cell phones. Because such as nuclear magnetic **** oscillator, ultrasound, electrocardiograph, CT instrument, etc., to the cell phone issued by the high-frequency signals, very sensitive, once disturbed, will occur misdiagnosis of the accident.
4. Disabled at gas stations. Because the gas counter is electronically controlled, if it is interfered by cell phone signals, it is easy to affect the accuracy of measurement and even induce fire.
5. Blasting site, or other potential blasting hazardous areas to turn off the phone. In order to avoid the signal emitted by the phone to trigger the blasting device.