Do one of the following:
You can set the phone to vibrate when it rings for calls.
To extend battery life, turn vibrate off.
You can choose a unique ringtone for calls from specific people so you'll know instantly who's calling.
Do one of the following:
You can set a default sound for notifications from apps including messaging and email. You can also set a unique ringtone for notifications from specific apps. Learn how.
Although your phone comes with lots of ringtones, you can get more:
If you're not hearing your ringtones: