Filed under: CellphonesEven 6 months ago, it would have been inconceivable to imagine the CEO of the biggest cellphone operator in the US sniping at its primary competitor's hints at becoming more open. The key point being that none of the cellphone operators in the US are actually "open" by any objective definition, so maybe AT&T CEO Randall Stephenson should have bitten his tongue rather than stating that his company is "probably one of the most open networks in the world," in a mild rebuke to Verizon's open network plan for 2008. Also Randall, stating that "all of th