Huawei ETS2528 User Manual page 20

Select Menu > Settings > Phone Settings > Keyguard.
Press the up/down key to select:
Off: Deactivate the keyguard function.
30 Seconds, 2 Minutes or 5 Minutes: Set the FWT to lock automatically if there is no
operation in 30 seconds, 2 minutes or 5 minutes.
Unlocking the Keypad
Press . Then press the * key to unlock the keypad.
18