Many people many say that cell phones are faster and more convenient for communication in emergency events. Sometime, they should be aware how to use the phone at a right time and place. Example, in the theater, there are exactly some advertisements before movies shall be started reminding people to turn off or sound off their cell phones during watching the movies in order not to disturb anyone else. Especially at school, this can cause inappropriate behavior i.e. talking on the phone (using cell phone) in class