Menu 11, ActivateKeyguardPress left F (Menu)then 11Keyguard remains on until you deactivate by pressingleft F (Menu) then ∗. When the function is activatedand there is no call in progress, no key tones are heardand no key presses are be accepted, except for calls to911 (or other official preprogrammed emergencynumber) and U and E.When placing an emergency call, the emergencynumber is displayed only after you have keyed in all itsdigits. After the emergency call, Keyguard automaticallybecomes active again. Keyguard cannot be activatedwhen the phone is connected to a car kit or in thehandsfree desktop charger.46