Call Manager is a free Android app developed by Telkomsel that allows you to temporarily block any incoming call by using a tone alert based on your activity. With Call Manager, you can easily activate a specific profile based on your activity, such as "Driving" or "Meeting". Once activated, any incoming call will be blocked and the caller will receive a tone alert informing them of your current activity.

The app is easy to use and offers a variety of profiles to choose from, including "Outdoor", "Sleeping", and "Busy". You can also create your own custom profiles and set specific times for them to be activated. Call Manager is a great tool for anyone who needs to block incoming calls temporarily and wants to do so with ease.