Samsung SCHI830 Phone Manual page 182

Choose between Automatic and Manual. After your selection
press .
SMS Tab
The SMS tab allows you to configure the SMS callback
number.
To access the options on this menu:
1.
Tap the Start menu bar located in the upper left corner
of the screen.
2.
Tap Settings, and ensure that the Personal tab is
displayed.
3.
Tap the Phone icon, and then select the SMS tab.
174 Section 2I: Sprint Worldwide Wireless Service