BLOCK: From the home screen, select the Messages app. Select and hold the desired message > Block icon > OK.
Note: Alternately, you can block a contact by selecting the Messages app > Menu icon > Blocked contacts > ADD A NUMBER > enter desired phone number > select BLOCK.
UNBLOCK: From the Messages app, select the Menu icon then select Blocked contacts. Select the Unblock icon next to the desired contact, then select UNBLOCK.Â