Nokia 6230

Would anyone know why my 6230 would suddenly start displaying images in Black and White on Cingular’s Media Net? This has happened before and no one seemed to know why it started. They replaced my Sim Card and everything returned to normal. Well it has started doing something similar. This time, instead of black and white it is displaying images in a single color. It’s like it switched to a low color palette or something. Can someone help?

Derek