Samsung SCH-I830MSASPR - Manual (Page 174)

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