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When you're ready to turn on encryption:
1. Touch the
Home Key > > Settings > Security > Encrypt phone.
2. Read the information about encryption carefully.
The
Encrypt phone button is dimmed if your battery is not charged or your phone
is not plugged in.
If you change your mind about encrypting your phone, touch the Back Key.
WARNING!
If you interrupt the encryption process, you will lose data.
3. Touch Encrypt phone.
4. Enter your lock screen PIN or password and touch Next.
5. Touch Encrypt phone again.
The encryption process starts and displays its progress. Encryption can take an hour
or more, during which time your phone may restart several times.
When encryption is completed, you're prompted to enter your PIN or password.
Subsequently you must enter your PIN or password each time you power on your
phone in order to decrypt it.