Comfortable Call is a free Android application developed by Maestainer that allows you to manage your calls conveniently. With this app, you can prevent notification sounds and vibrations from interrupting your calls, and you can also prevent your screen from locking automatically.

One of the best features of Comfortable Call is that it supports not only the default dialer but also other dialers such as LINE and Skype. So, you can use this app with any dialer that you prefer.

It is important to note that this app prevents notification sounds and vibrations by setting your phone to silent mode during a call. However, important notifications such as alarms may still sound even in silent mode. Therefore, it is recommended to check your device's sound settings before using Comfortable Call.