Samsung SCH-3500 - Manual (Page 63)

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Erasing messages.
You can erase an individual text message or numeric page
after reviewing it, or erase all stored text messages and
numeric pages at one time.
To erase all text messages and numeric pages:
1. Press to display the Messages Menu.
2. Press for Security and enter the lock code.
3. Press for Erase.
4. Press for Messages.
5. Press to erase all text messages and numeric
pages, or to return to the previous screen.
To erase a message after reviewing it, refer to the previous
section.