Samsung SCH-T300 - Manual (Page 49)

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Erase Total
To erase your total air time:
1. Press to display the menu.
2. Press for Calls.
3. Press for Air Time.
4. Press to Erase Total. Press in the center to erase the
“Total” airtime measurement, or press to cancel the operation
and return to the previous display screen.
Note: If you choose the Erase Total option, the counter is reset to “zero” and
begins counting the next time you make or receive a call.