1. From the home screen, tap Messaging.
   
2. Press the Menu key, and then tap Settings.
   
3. Scroll to and tap the Spam settings checkbox to turn message blocking on or off.
   Note: When on, the box will appear with a green check.
   
4. To block and unblock specific numbers, tap Add to spam numbers.
   
5. Tap Add.
   
6. Enter the desired number manually or tap the Contacts icon to select from your contacts.
   
7. This message blocking feature may not stop your phone from sending or receiving messages via third-party apps installed on your device. Please contact the developer for assistance with these applications.