Apple iPhone 4s - Assignable ringtones and vibrations

Increase text contrast where possible. Go to Settings > General > Accessibility, then turn
on Increase Contrast.
Button Shapes
iPhone can add a colored background shape or an underline to buttons so they’re easier to
see.
Emphasize buttons. Go to Settings > General > Accessibility, then turn on Button Shapes.
Reduce screen motion
You can stop the movement of some screen elements, for example, the parallax effect of
icons and alerts against the wallpaper, or motion transitions.
Reduce motion. Go to Settings > General > Accessibility, then turn on Reduce Motion.
On/off switch labels
To make it easier to distinguish whether a setting is on or off, you can have iPhone show an
additional label on on/off switches.
Add switch-setting labels. Go to Settings > General > Accessibility, then turn on the
On/Off Labels switch.
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 .
You can purchase ringtones from the iTunes Store on iPhone. See .
Audio Descriptions
Audio Descriptions provides an audible description of video scenes. If you have a video that
includes audio descriptions, iPhone can play them for you.
Sounds and silence
iTunes Store at a glance