Zte A139+ User Manual page 45

Fixed Dial: You can enable or disable fix dialing to specified phone numbers only.
You must enter your PIN2 code for authentication.
Barred Dial: You can set any combination of the following call restriction options to
improve security level. Please contact with the network service provider for
detailed use.
Change Password: You can change PIN code, PIN2 code and Phone Lock
Password here.
Restore Factory setting
Enter password to restore to the factory setting.
Sound Effect
You can select one Equalizer, and also you can edit or rename these Equalizers.
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