Why won't my iPhone 5s let me update to iOS8?

My iPhone 5s won't let me update to iOS 8. I have 6GB of space for the update and enough battery percentage. I have the notification for the update and every time I try to update it all it says is "checking for update" for a long time and nothing comes up. Also my App Store and ITunes store every time I search something nothing pops up.what's wrong with my phone?!Why won t my iPhone 5s let me update to iOS8 - 1

This means that you are already on iOS 8. Double click the home button to get to multitasking. If you see a list of circular contacts at the top, your phone is already running iOS 8.

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