1. To block a number, from the Start screen, tap the Messaging tile.
   
2. Tap and hold the message thread you want to block.
   
3. Tap Block contact.
   
4. Tap Block.
   
5. To view a list of blocked numbers, from the messaging threads, tap the menu icon.
   
6. Tap Blocked messages.
   
7. Tap the menu icon.
   
8. Tap Block list.
   
9. Your blocked numbers list will be displayed.
   
10. To unblock a number, tap and hold the desired number.
    
11. Tap unblock number.
    
12. The number is now unblocked.