Do not upgrade to iOS 11.
Do not upgrade to iOS 11. Use iOS 10 for as long as possible. I have iphone SE , after updating it to iOS 11 it bacame way slower and battery dont last as long. Okay , there are some pros also. There are couple of new features , fully remaked control panel ( even customizable) and a lot of more. Do your choise. Im just saying that u fan feel the difference in battery life and performance.