Samsung SCHI830 Phone Manual page 174

International: Disable international calls only.
International Except To Home: Disable international
calls, except those calls to your home.
All Incoming: Disable all incoming calls.
In While Abroad: Disable all international calls while
out of your home service area.
Off: Cancel all Call Barring.
5.
Enter your selection and tap .
166 Section 2I: Sprint Worldwide Wireless Service