Why is my iphone deleting my texts?

I just reently got a new iphone its an iphone 4s and its not updated to the newest version its still at 5.0.1 but for some reason ill scroll up in a message coversation and the texts from before will be gone. It seems like whenever i receive new texts the old ones get deleted for the new ones but how do i change this so none of them get deleted

Shoulda pre-ordered the iphone 5 like I did

Update it. Or use the settings and go to messages and see of there's something that says like "delete old messages" or something like that

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