Samsung SCH-I830MSASPR - Manual (Page 180)

172 Section 2I: Sprint Worldwide Wireless Service
3. Tap the Phone icon, and then tap the Services tab.
4. Tap Caller Waiting, and then tap the Get Settings...
5. Highlight Call Waiting, and then press .
6. Highlight Activate, and then press .
Voicemail and Text Messages
To activate voicemail settings:
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.
4. Tap Voicemail and Text Messages, and tap the Get
Settings...
5. The number to call your voicemail is displayed in the
SMS service center and Voicemail box. To change the
number, tap the box and enter the number you want.
6. Press .
Note: This number is automatically setup when you receive your
phone. You will probably not need to change it unless
otherwise instructed by your carrier.