Ad network Chitika is reporting that iOS 6.1.2 has overtaken all other previous versions of iOS to become the top most-used version just four days after being released, despite coming just over a week after iOS 6.1.1 (which was available only to iPhone 4S users). The study, which measured mobile ad impressions across tens of millions of iOS devices from February 19 through to Sunday night, showed that iOS 6.1.2 is already accounting for more than 35 percent of North American iOS web traffic, making it the most popular single version.
