T-Mobile shadow User Manual page 120

10 Exchanging Messages
To block a phone number from sending you Picture Messages
You can choose to block a phone number from sending you Picture Messages if you
do not want to receive future Picture Messages from that number.
1. View the Picture Message and then select Menu > Show > Contact Details.
2. In the Contact Details screen, select the contact in the From field.
3. Select Menu > Save to Blacklist.
Note
By adding the number to the Blacklist, you will not receive future Picture Messages
from that number. To edit the MMS Blacklist, from the Home screen, select Start >
Settings > Multimedia Messaging > Menu > Edit Blacklist. Here, you can remove a
number from the Blacklist or change the name of the blacklisted contact.