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[Main function]
- Call termination be the lock screen by pressing the power button.
- Call if continued beyond the time that has been set, call termination.
- The end call option by the transmission / reception.
- Possible extension of currency using the alert window to the call at the end of the time limit.
[The main purpose]
- Prevent a long time in advance calls that are not pressed the end button after call
- Fee prevention of those who are not familiar with the smartphone, such as children and the elderly