Appendix A Tips and Troubleshooting 120
Updating and Restoring iPhone Software You can use iTunes to update or restore iPhone software. You should always update
iPhone to use the latest software. You can also restore the software, which returns
iPhone to its original state.
 If you update, the iPhone software is updated but your settings and songs are not
affected.
 If you restore, all data is erased from iPhone, including songs, videos, contacts, photos,
calendar information, and any other data. All iPhone settings are restored to their
original state.
Update or restore iPhone
1 Make sure you have an Internet connection and have installed the latest version of
iTunes from www.apple.com/itunes.
2 Connect iPhone to your computer.
3 In iTunes, select iPhone in the Source pane and click the Summary tab.
4 Click “Check for Update.” iTunes tells you if there’s a newer version of the iPhone
software available.
5 Click Update to install the latest version of the software. Or click Restore to restore
iPhone to its original settings and erase all data on iPhone. Follow the onscreen
instructions to complete the restore process.
Using iPhone Accessibility Features The following features may make it easier for you to use iPhone if you have a disability.
TTY support (available in some areas)
Use iPhone in TTY mode with the iPhone TTY Adapter (available separately) to use a
Teletype (TTY) machine. See “Using iPhone with a Teletype (TTY ) Machine” on
page 102.
Closed captioning
When available, you can turn on closed captioning for videos. See “Turn closed
captioning on or off” on page 105.
Minimum font size for Mail messages
Set a minimum font size for Mail message text to Large, Extra Large, or Giant to
increase readability. See “Set a minimum font size for messages” on page 101.
Large keypad
Make phone calls simply by tapping entries in your contacts and favorites lists. When
you need to dial a number, iPhone’s large numeric keypad makes it easy. See “Dial a
call” on page 30.