Nokia 8265 - Manual (Page 44)

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10
Clear call timers
1 Press Menu 2-5-5 (Menu > Call log > Call timers > Clear timers).
2 At the Security code prompt, enter your five-digit security code and
press OK.
Caution: The Clear timers option cannot be undone. If you
use the call timers to log or track the amount of time you are
using your phone, you may want to write down this
information before you erase it.