In addition to the five included vibration patterns, you can create your own. Just choose to edit a contact within the Phone app and then tap the Vibration entry. In the Vibration screen that appears, select Create New Vibration. In the New Vibration screen, tap out the rhythm to "Shave and a Haircut" or "Jingle Bells" or "Louie Louie," if you like. Tap Play to check your work, tap Save, and then name the pattern. Select it in the Custom area of the Vibration window, and tap Done in the top left corner to attach it to your contact. You can also change the device's default vibration to a custom vibration.

Switch this iPhone 4-- and 4S--only option on, and your phone's camera flash will blink when you receive an alert for an incoming text message, push notification, or call.

Stereo is a problem for people who have difficulty hearing equally from both ears. This option alters a stereo signal through the headphone port so that both sides of the stereo stream are broadcast through each earpiece.