This app is the easiest and simplest mobile phone call time timer in Japan. Very popular! We are delivering a new version because of its popularity. It is a billing prevention measure application for the "10 minutes 5 minutes all-you-can-eat / all-you-can-talk" plan. Easy to operate, super simple. (1) Set the timer time and (2) just press the phone button. With this app, you can take measures against billing over voice call time and give you a safe smartphone life. Here are 6 features of this