Samsung SCH-T300 - Manual (Page 50)

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Lifetime
Lifetime air time is the amount of time the phone has been used since it
was activated. All incoming and outgoing calls are saved in the log.
To view your total lifetime air time:
1. Press to display the menu.
2. Press for Calls
3. Press for Air Time.
4. Press for Life Time.
5. Press to quit or to return to the previous menu.
Note: You cannot erase any information created by this option.