Brian and his wife have been using Straight Talk wireless and recently brought over an unlocked Windows Phone to their plan. But she can't send images via attachment. Everything else works, just not MMS. Leo says that it may not be supported. Brian says his plan does support it. Leo says normally it's an APN setting, and he may need to change his data settings on StraightTalk's website here. StraightTalk has a forum post that may help him. There's a setting called "MMS C" that needs to be enabled.
Brian has written a book on information technology and security and has dedicated it to Leo's work. Leo says the book on information security is much needed.