ZTE Blade A430 - Manual (Page 26)

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When you're ready to turn on encryption:
1. Touch 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
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.