Sharp AQUOS Crystal - Manual (Page 402)

Settings 393
5. Touch Encrypt phone.
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Encrypting starts and then the phone restarts.
Phone Encryption Cautions
Files on your phone can be encrypted with Encrypt phone.
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After performing Encrypt phone, storage decryption password entry window appears each
time your phone is powered on. Enter PIN or password set in Screen lock.
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To disable encryption of your phone, perform Reset all.
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Charge your phone adequately beforehand, and charge your phone during the encryption
process.
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If Encrypt phone is interrupted, all files on your phone will be deleted.
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Emergency calls cannot be placed in storage decryption password entry window.
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If incorrect PIN or password is entered 10 times and 20 times consecutively in storage
decryption password entry window, input will be disabled for 30 seconds. Note that your phone
will be initialized after 30 consecutive failures.
Encrypt microSD
1. From home, touch > Settings .