Individual call and text tones can be set for contacts so it’s easy to know who’s getting in contact without having to physically look.
From Contacts, go to the contact entry and tap Edit. Scroll down until you reach the Ringtone or Text Tone option.
Tap on either and choose a new tone for that contact. Tap Done and that person will now have their own unique tone.
It’s also possible to change the vibration used for calls or texts for each person. While editing the custom ringtone or text tone, tap the Vibration option and choose from the options.
From the bottom of the list you can also add your own by tapping Create New Vibration. Now tap or hold the screen to add a vibration pattern. When satisfied, tap Save at the top and then select the new pattern from the list.