Hi, everyone. At this point, I don't know what to do. So, please give me an advice. My wife's iphone (4s) had an incredible battery life on 5.01. However, after upgrading to 5.1, it suddenly started to drain the battery very quickly. As a first attempt, I did what I could do. things like hard-resetting, calibrating..etc. It didn't help. Then, I found out that the phone is having so-called 'the ghost usage time'. So, I visited the Genius bar today and they did a clean install. (they told me that what they did was the deepest resetting method). Hoping that the problem is solved, I charged up the phone and watched it over without using it for two hours. And now..it shows the 'ghost usage time' AGAIN. right now, the stand-by time is 2 hours 15 minutes and the usage time is 2 hours 1 minutes. And as expected, the battery is draining rapidly. My question is 'Now what?'. I tried everything that I could do. Do you think I should visit the Genius Bar again and see what they say? Is there anything that I should try before going to the Genius bar? Thanks a lot.