My iPhone 5c don't work after the iOS 8 update?

(iPhone )I can't connect to AppStore, FaceTime, iTunes, IMessage. I can't sign into my Apple ID either. It tells me can't connect to iTunes Store when I try too. When I enter my Apple ID on the AppStore it also says can't connect to iTunes Store. On iPhone 5c. I need to download a math app for school! I already rested all my stuff. And it still won't work.

Please help people

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