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Crank Prank Time Phone is a machine which allows people to only prank call the past. In "Go God Go XII", Cartman used it to call Butters, Kyle and himself, asking them to stop him from freezing himself, but no one believed him. Butters did, but Cartman was already in his house, so he talked to himself again. According to the people in that episode; using it in the way described (to change the past, which will rewrite the future) is illegal.