iphone 4 pictures in messages not showing

iPhone 4 pictures in messages not showing
location: macrumors.com - date: October 27, 2010
I have just gone through some messages in my iPhone 4 and I have noticed that where there used to be pictures or 'mms' there is now a little blue circle with an arrow on it, I click this and it is a black screen with no picture. I can understand if pictures that I have sent in messages from my camera roll might not show up after being deleted, but everything sent to me by other people is now gone as well, it just shows a black screen. Any idea what has caused this and how to fix it???
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