Zte T230 User Manual page 10

WAKE UP FROM SLEEP MODE
 Press the Power key to activate the
display.

Long press on the green Lock button to
unlock.
SWITCH YOUR HANDSET TO SLEEP MODE
Press the Power key to activate sleep
mode.
Sleep Mode activates automatically with
the timeout set from Options > Settings >
My Device Tab > Display > Sleep.
TIP
If you set an unlock pattern, PIN or password you need to enter it to
unlock the screen. If you forget your pattern or PIN use your Google
Account password to reset the phone. This will only work if you
register a Google account with this handset.