HTC One S is considered a mid-range smartphone from the three HTC One series which was recently released. Apparently, HTC One S is slowly showing its flaws to the tech-consumers who bought this smartphone. The recent and latest issue found is the HTC’s battery problem when you are engaged in WiFi calls. Some of our friends in the U.K. and the U.S. were already enjoying using this smart phone. Although this smartphone is quite powerful, it is still far from being perfect. Two weeks ago, we received reports and shared to you the chipping problem discovered on HTC One S redesigned body. And now, Magenta HTC One S users were complaining that their battery life is dropping so fast with T-Mobile’s free WiFi call features.