If you have starting free minutes every outgoing phone call USE IT for saving your money.

How to use
1st Step: Download this app from Google play and install it(it need call-phone permission which includes hang-up feature)
2nd Step: Open the app and choose the countdown minutes(default is ten
3rd Step: Leave the app(Auto save feature is working)
4th Step: Done and the hang-up service will be activated at the next outgoing call

Advanced usage
1. When the service is activated the notification will be shown on the top of phone
2. When the service is activated you can force to disable it by using the switch in the app(click notification is a shortcut to wake up the app)
3. When ongoing call is working changing the minutes and re-enabling the service will take effect at next outgoing call

Note
1. Incoming calls will not activate the service
2. The service will Only activate in a outgoing call and not always occupy the memory