Samsung Galaxy S III User Manual page 352

Device Ringtone
This option allows you to assign a default ringtone when an incoming
voicemail message is received.
1. From the main Call settings page, tap Ringtone.
2. Select a ringtone and tap OK.
Vibrate
This option allows you to activate a vibration when an incoming
voicemail message is received.
1. From the main Call settings page, tap Vibrate.
2. Select an available option. Choose from: Always, Only in Silent
mode, or Never.
US and International Dialing
Similar to prefix dialing, these two menus allow you to use either a
default "011" entry when using the "+" dialing shortcut, or replace it
with a new user-defined set of digits.
To dial a U.S. long distance code:
1. From the Home screen, tap
2. Touch and hold
uses the International dialing prefix entered into the
International dialing menu. The default is "011".
To change the International dialing prefix:
1. From the main Call settings page, tap Call settings
2. Remove the check from the US dialing field and then tap the
International dialing field.
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(Phone).
to display "+" on-screen. This shortcut