User Guide

Chapter 3 Basics 42
Security
Security features help protect the information on iPhone from being accessed by others.
Use a passcode with data protection
For better security, you can set a passcode that must be entered each time you turn on or wake
up iPhone.
Set a passcode. Go to Settings > Touch ID & Passcode (iPhone models with Touch ID) or
Settings > Passcode (other models), then set a 4-digit passcode.
Setting a passcode turns on data protection, using your passcode as a key to encrypt Mail
messages and attachments stored on iPhone, using 256-bit AES encryption. (Other apps may
also use data protection.)
Increase security. 
a combination of numbers and letters, you use the keyboard. If you prefer to unlock iPhone using
the numeric keypad, create a passcode using numbers only.
(iPhone models with Touch ID) Go to
Settings > Touch ID & Passcode. See Touch ID, below.
Allow access to features when iPhone is locked. Go to Settings > Touch ID & Passcode (iPhone
models with Touch ID) or Settings > Passcode (other models). Optional features include:
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Today
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Siri (if enabled, see Siri settings on page 47)
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Passbook (see Chapter 26, Passbook, on page 12 3 )
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Reply with Message (see When someone calls on page 49)
Allow access to Control Center when iPhone is locked. Go to Settings > Control Center.
See Control Center on page 33.
Erase data after ten failed passcode attempts. Go to Settings > Touch ID & Passcode (iPhone
models with Touch ID) or Settings > Passcode (other models), then tap Erase Data. After ten
failed passcode attempts, all settings are reset, and all your information and media are erased by
removing the encryption key to the data.
If you forget your passcode, you must restore the iPhone software. See Restore iPhone on
page 178 .
Touch ID
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Entering your passcode to unlock iPhone
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Using your Apple ID password to make purchases in the iTunes Store, App Store, or iBooks
Store
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Apple Pay as a method of payment
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Providing debit and credit card info, billing and shipping addresses, and contact info when
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Set up the Touch ID sensor. Go to Settings > Touch ID & Passcode. Set whether you want to use
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
example, or one for your spouse).