Nokia 2160 - Manual (Page 50)

Menu 11, Activate
Keyguard Press left
F
(Menu)
then 11
Keyguard remains on until you deactivate by pressing
left F
(Menu) then ∗ . When the function is activated
and there is no call in progress, no key tones are heard
and no key presses are be accepted, except for calls to
911 (or other official preprogrammed emergency
number) and
U
and
E
.
When placing an emergency call, the emergency
number is displayed only after you have keyed in all its
digits. After the emergency call, Keyguard automatically
becomes active again. Keyguard cannot be activated
when the phone is connected to a car kit or in the
handsfree desktop charger.
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