Samsung Galaxy S III User Manual page 122

Security
The Security settings allow you to determine the security
level for your phone.
Encryption
You can set your phone to require a numeric PIN or password
to decrypt your phone each time you power it on or encrypt
the data on your SD card each time it is connected.
Important! Before encrypting your device, you must set an
Unlock password of at least 6 characters and 1
number. For more information, refer to "Lock
screen" on page 89.
Tip: Make sure your battery is charged more than 80 percent.
Encryption may take an hour or more.
1. From the More menu, tap Security. The following
options are available:
2. Tap Encrypt device. For more information, read the
displayed help screen.
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3. Tap Encrypt external SD card to enable the encryption
on SD card data that requires a password be entered
each time the microSD card is connected.
Factory data reset password
Use the Set up/change password option to set up your Factory
data reset password when one is first required, or to change
your current password.
1. From the More menu, tap Security
password.
2. Enter a new password and tap Confirm.
3. Enter the new password again and tap Confirm.
Set up/change