ZTE Blade 3 - Manual (Page 26)

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The Encrypt phone button is dimmed if your battery's not
charged or your phone's 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. Encryp-
tion 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, to decrypt it.