Nothing work on my iPhone 5c

Hi, I have a iphone 5c and nothing work on it. I can't go on app store, i can't write the sim code because it says please wait, and i can't update to 8.3.
I have ios 8.1.3 and 9.2gb free space
Someone please help!!!!!

Try doing a reboot in case something is hanging up the memory:   hold both the power and home buttons until the apple logo appears, then release both buttons and let the iPhone complete its startup sequence.

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