Samsung SCH i830 - Manual (Page 110)

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incoming call. Unlike Call Waiting in Verizon (CDMA)
mode, Call Waiting in GSM mode must first be activated.
Note: When roaming off the Verizon Wireless Network, availability of this
feature varies by service provider and may be limited or restricted in some
areas.
1. Tap Start located in the upper left corner of the screen.
2. Tap Settings, the Personal tab is displayed.
3. Tap Phone. Tap the Services tab.
4. Tap Caller Waiting, and tap Get Settings...
5. Highlight Call Waiting, then press .
6. Highlight Activate, then press .
Voice Mail and SMS
1. Tap Start located in the upper left corner of the screen.
2. Tap Settings, the Personal tab is displayed.
3. Tap the Phone icon.
4. Tap Voice Mail and SMS, and tap Get Settings...
5. The number to call your voicemail is displayed in the
SMS service center and Voice Mail 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.