1. From the home screen, tap Messages.
   
2. Press the Menu key.
   
3. Tap Settings.
   
4. To block a number, tap Register number as spam.
   
5. Tap Create.
   
6. Enter the desired phone number.
   
7. Tap Save.
   
8. To remove a number, first touch and hold the number.
   
9. Tap Delete.
   
10. Tap OK.
    
11. Tap the Spam settings checkbox to toggle blocked messages on / off.