Samsung SCH-R890ZWAUSC - Manual (Page 51)

Calling 46
Voice Mail
All unanswered calls to your device are sent to voicemail,
even if your device is turned off, so you’ll want to set up your
voicemail and personal greeting as soon as you activate your
device.
For more information, see “Voicemail” on page 123.
Call Settings
For information on configuring call settings, see “Call
Settings” on page 119.