Samsung SCH-T300 - Manual (Page 48)

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Total
Total air time is the amount of time the phone has been used since it
was last erased. All incoming and outgoing calls are saved in the log.
This feature is not intended for billing purposes.
To view or erase total air time:
1. Press to display the menu.
2. Press for Calls.
3. Press for Air Time.
4. Press: for Total. The screen displays the total number of calls
and the total air time for all calls since you set this total to zero (by using
the “Erase Total” option).
5. Press to return to the previous display screen, or press
in the center to quit.