Samsung SCH-T300 - Manual (Page 122)

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Setup
Auto Retry
When the Auto retry option is activated, your phone automatically
retries the last call up to ten times when a connection fails.
How to enable Auto Retry.
1. Press to display the menu.
2. Press for Setup.
3. Press for Auto Retry. The Auto Retry screen displays.
4. Press to toggle between Off, every 10 seconds, every 30 seconds
and every 60 seconds. Press the same key in the center to save your
option.
5. Pressing returns you to the previous screen.