1. From the home screen, tap Messaging.
   
2. Press the Menu key.
   
3. Scroll to, then tap Settings.
   
4. Scroll to, then tap the Spam settings checkbox.
   
5. Tap Add to spam numbers.
   
6. Tap the Add icon.
   
7. Enter the desired phone number.
   
8. Tap Save.
   Note: Tap 'Match criteria' to edit the match criteria. You can set an area code or any number prefix to be blocked.
   
9. To remove a number from the block list, tap the desired number.
   
10. Tap Delete.
    
11. Tap OK.