The present invention simplifies the keypad and function keys attached to the mobile phone without displaying a display device for displaying various additional information used in the existing mobile phone, and eliminates various functions of the mobile phone. It is easy to identify the numbers by increasing the number and is composed of a number key that is easy to press. Opening the flip of the mobile phone goes to the call waiting state and enters the phone number immediately to make a call, and closing the flip of the mobile phone after the call is configured to end the call, giving the same effect as using a regular phone. By not installing devices, function keys, etc., the manufacturing cost is greatly reduced, and the power consumption is small, so the use time can be extended and can be simplified.
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