User's Guide

APPLE CONFIDENTIAL — First Draft (1.10.11)
Using iPhone with a Teletype (TTY) Machine
In some countries or regions, Teletype (TTY) machines are used by deaf or hearing-
impaired people to communicate by typing and reading text. You can use iPhone
with a TTY machine if you have the iPhone TTY Adapter cable, available for purchase
separately in many countries. Go to www.apple.com/store (may not be available in all
countries or regions) or check with your local Apple retailer.
Connect iPhone to a TTY machine: Choose Phone, then turn TTY on. Then connect
iPhone to your TTY machine using the iPhone TTY Adapter.
For information about using a TTY machine, see the documentation that came with
the machine.
For information about other accessibility features of iPhone, see
Chapter 29, “Accessibility,” on page 235.
Calling from Abroad
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tap Phone, then turn International Assist on. This lets you make calls to your home
country using the numbers in your contacts and favorites lists, without having to add a
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For more information, see “Using iPhone Abroad” on page 77.
Changing Your Voicemail Password
A voicemail password helps prevent others from access your voicemail. You need to
enter the password only when you’re calling in to get your messages from another
phone. You won’t need to enter the password when using voicemail on iPhone.
Change your voicemail password: Choose Phone > Change Voicemail Password.
Locking Your SIM Card
You can lock your SIM card (GSM models only), so it can’t be used without a Personal
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turn it back on again. Some carriers require a SIM PIN in order to use iPhone.
Important: If you enter the PIN incorrectly three times, you may need to enter a
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documentation or contact your carrier. Some cellular networks may not accept an
emergency call from iPhone if the SIM card is locked.
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PIN.
Change the PIN for your SIM card:
1 Choose Phone > SIM PIN.
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Chapter 25 Settings