Learn how to change Ringtones and vibrations on your iPhone 5s.
Assignable ringtones and vibrations
You can assign distinctive ringtones to people in your contacts list for audible caller ID. You can also assign vibration patterns for notifications from specific apps, for phone calls, for FaceTime calls or messages from special contacts, and to alert you of a variety of other events, including new voicemail, new mail, sent mail, Tweet, Facebook Post, and reminders. Choose from existing patterns, or create new ones. See “How To Configure Sound - iPhone 5S”.
You can purchase ringtones from the iTunes Store on iPhone. See “How To Use iTunes Store - iPhone 5S”.