Zte X175 User Manual page 27

ZTE
Besides sending and receiving calls, you can also do:
Press OK key to enter main Menu.
Hold Clear key to lock phone's keypad.
Hold Up key to set the phone in Silence All.
Press Down key to enter Messages menu.
Press Left key to enter Extra menu.
Press Right key to view All Contacts.
Press Send key to enter All Recent Calls.
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