This has happened to me twice already on my jailbroke iphone 4s. The first time I thought maybe I accidentally deleted all messages, then it happened again. The second time happen a couple days after the 1st time. I heard that I got a message but did not look at it, then several minutes later I heard I had another message so I looked and the only message that was on there was the last one to come in. I search but found no info on this problem, anyone else experiencing this and if so how do you fix it.