Samsung BlackJack SGH-i607

Every time someone sends me an MMS message, it gives me the "Someone has sent you an MMS message, go to this web site to view it!" dialogue. Of all the phones I've ever had, you would imagine that the Blackjack could handle displaying a picture message! Does anyone know why this is happening and if so, how to fix it? Oh, and I also can't send MMS messages and all of my settings are correct.