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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.  Type your lock screen PIN or password and touch NEXT. 
5.  Touch ENCRYPT PHONE again. 
The encryption process starts. Encryption can take an hour 
or more, during which time your phone may restart several 
times. 
When encryption completes, it prompts for the PIN or 
password. 
You must type the PIN or password each time you power on 
the phone to decrypt it. 
Protecting Your Phone with Screen 
Pinning 
Use the screen pinning feature to keep an app in view, so 
others cannot switch to other apps or access your personal 
information. 
Turning On Screen Pinning 
1.  Touch the Home key >    > Settings > Security > 
Screen pinning. 
2.  Touch the On/Off switch.