ZTE Arizona hard reset:
You can reset your ZTE device's password: Turn off your phone, then turn it on. Select emergency dial. Input *983*987# in emergency dial-up pad. It will restore factory settings and your personal data will be erased.
Privacy: Reset to Factory Settings
Press the Menu Key > Settings > Privacy > Factory data reset > Reset phone > Erase everything.
WARNING: All your personal information and downloaded applications on your phone will be erased
after resetting the phone.