Samsung SCH-N150 - Manual (Page 48)

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Erase total
If you choose the Erase Total option, the counter for all air times with the
exception of LifeTime, will be set to “zero”. The counter will begin counting the
next time you make or receive a call.
To erase your total air time.
1. In standby mode, press to display the main menu.
2. Press for Calls .
3. Press for Air Time .
4. Press for Erase Total . Toggle to highlight Yes or No .
5. With Yes highlighted, press to erase the total airtime and return
to standby mode, or press to cancel the operation and return to
the previous display screen.