Settings and customization Enable/Disable notifications sounds
Open "Settings app" or : - tap on "Sound & notification", - tap on "General" , - tap on "Default notification sound", - select "Silent" or a ringtone and tap on OK to save.* or Open "Settings app" or : - tap on "Sound & notification" or "Sound", - tap on "Default notification ringtone", - select "None" or a ringtone and tap on OK to save.*