Advanced Task Manager is a free utility tool for Android that helps in killing tasks, freeing up memory, speeding up the phone, and saving battery life. It is compatible with all Android versions and provides a CPU lagging monitor to remind users if any app is lagging the phone. The app also features an app or game killer, Android optimizer, and one-click task kill widget. It provides a quick uninstaller and shows battery usage. Additionally, it supports killing apps to stop GPS and has a permission manager add-on for Android 4.3 (App Ops).

The task management mechanism of the Android system has been changed after the release of the version 2.2 of the Android system. Therefore, task killers cannot kill the services and notifications on the phone. By using the Advanced Task Manager, users can stop tasks in three easy steps: long press the task that they want to stop, choose the "force stop" option, and press the "force stop" button on the application info system panel. If users want to manage running services, they can click menu->service, and it will open the system service panel where they can stop running services.

Please note that installing other task manager or task killer tools may make the phone unstable or cause potential conflict. Overall, Advanced Task Manager is a useful app to manage tasks and optimize the phone's performance.