Hi, do you know where I can find a detailed guide about all of the settings of iOS 7 ? I'm trying to tweak the system to optimize performance and battery life, but I don't really trust the "how to" guides I can find on the net, which most of the time just say "disable this, this and this" without explaining (and maybe without really knowing !) what they are doing. I would like to have a guide where every single setting is explained so I can decide by myself what I need and what I don't. Just an example: most of the web sites suggest to disable background app refresh. Ok, but doing that what I'm really disabling ? What kind of "refresh" I'm switching off ? How that will change the behavior of my iPhone ? Which apps will be influenced and how ? This is just an example ... Thank you.