Nokia 6310i - Manual (Page 116)

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Manage phone security
Unlocking the keypad
Press Unlock and then within 1.5 seconds to unlock the keypad.
When the keyguard is on
To answer a call, press . During a call, the phone can be operated
normally. When you end or reject the call, the keypad will automatically
be locked.
Note: When Keyguard is on, calls may be possible to the
emergency number programmed into your phone (e.g. 911 or other
emergency number). Key in the emergency number and press
.
The number is displayed only after you have keyed in its last digit.