With new iOS, if you havent noticed yet, there is a new feature called widget, which is basicly the same thing as the ones in desktop operating systmes, except that it really works and is found useful by many. So install the important iPhone widgets before it becomes mainstream.
1. Location Services. Don’t allow every single app to use location services. Think before accepting if you need it, and how it’s going to affect your battery.
This is a sketch of what I see everyday. This is the city I live in – Almaty.