Get a free app called SMS Time Fix, and set it to use your phones clock time. It will fix this from happening.
My Nexus S doesn't do it. If it were Sprint, I would surely have the same issue, but I don't. Nor have I seen it with any of the blackberrys and palm pres that I have had.
The fact is its a sprint network thing. They know it. They admit it. Someone else on here also explained it.
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