Sometimes if you close an app from the task manager, it won't close completely and may still run in the background. To force close apps on Galaxy S7 ...Continue
To change the ringtone of your Samsung Galaxy S2 or other Samsung Galaxy devices do as follows:
1. Open "Setting" App
2. Go to "Sound"
3. Find "Device Ring tone" and Tap on it
4. Choose your favorite music or tone as the new Ringtone