Hello. I've recently updated my 4s to 6.1.2. Everything seemed quiet good at the beggining, but somehow I have noticed that sound quality is sligtly worse, I mean it's a bit distorted when it's at the highest level, I haven't experienced the same on 5.1.1 like just a week ago. Also, the battery is kind of an issue. I don't say that it's critical, but I've been counting, and one percentage drops in 3-4 minutes when in use, like browsing settings and listening to the music on the phone speaker. As I have heard iPhone isn't famous for a long battery life, but I've read that some people has 2-3% drop in a hour or so. I took a nap yesterday, before the battery was 78%, when I woke up it was like 70 or 72. I was sleeping just for a hour or hour and a half. As for now, I don't have any other issues with 6.1.2. What is really freaking me out is that sound quality has worsened, battery itself is quiet fine for me, but still, it could be better. Maybe I just should turn something off in the settings, I don't know.