Zte MF645 User Manual page 42

Note: If you enable the PIN code, you need to enter your PIN code every time
before you start to use your MF645.
2.Change the PIN code
Make sure to enable the PIN code.
Click Change PIN button.
Enter the old PIN code.
Enter the new PIN code twice.
Click OK.
3. Backup Phonebook and SMS
You can backup your Phonebook and SMS manually into the PC side.
Click Backup button.
Select the backup location in your PC.
Click Save.
If you want to update your Phonebook and SMS, you can click Resume.
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