Samsung Galaxy SII User Manual page 258

Important! Not all SIM cards use a PIN2 code. If your SIM card
does not, this menu does not display.
The PIN2 code is provided by your carrier. Entering
the PIN2 incorrectly three times will cause the
device to lock. Contact customer service for
assistance.
Managing the FDN List
When this feature is enabled, you can make calls only to
phone numbers stored in the FDN list on the SIM card.
1. From the main Call settings page, tap Additional
settings Fixed Dialing Numbers.
2. Tap Enable FDN.
3. At the prompt, enter your PIN2 code and tap OK.
FDN is enabled.
4. Tap FDN list then press
or edit the contacts that were stored.
253
and then tap Add contact
Important! Not all SIM cards use a PIN2 code. If your SIM card
does not, this menu does not display.
The PIN2 code is provided by your carrier. Entering
the PIN2 incorrectly three times will cause the
device to lock. Contact customer service for
assistance.
Voicemail
You can view your voicemail number from this menu.
1. From the main Call settings page, tap Voicemail service.
2. Tap Voice Mail.
3. If an additional voicemail service is in use (other than
carrier), tap Voice settings to now view your selected
voicemail number and information.