Nokia 3320 - Clear Call Timers

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From this point on, each call you make or receive will be timed. After a
call has ended, press any key on your phone to clear the current call’s
duration from the screen.
Clear call timers
1 Press Menu 2 > 5 > 6 (Call log > Call duration > Clear timers).
The Security code field appears.
2 Enter your security code and press OK.