Comparing a carrier-sanctioned device to its SIM-free counterpart often results in disappointment. Processor swaps and operator-imposed software tweaks don't usually mix well when it comes to performance (AT&T's Galaxy Note comes to mind). Well, you can rest easy: AT&T's One X bucks this trend and feels just as blazingly fast as the global model, if not brisker. In our benchmarks it beat the Tegra 3 variant in almost every test, with scores matching the Snapdragon S4-equipped One S in each category. All told, it's quite possibly the speediest handset we've ever played with.
..........................
Even with LTE enabled, battery life is noticeably better on AT&T's One X than on the foreign version. This was a sticking point in our original review, so we're extremely pleased with the improvement. We recorded eight hours and 55 minutes in our video loop rundown test with the screen set to 50 percent brightness -- most folks will have little trouble getting a full day's use from the 1,800mAh cell.