IPhone 4 Won't Unlock/Unresponsive?

Earlier today my iPhone 4 locked up and will not unlock. I can't get it to do anything. When I press the button the screen lights up as it normally does, but there's a message that appears on the screen. The message says: Not enough storage. I have gotten this message before, but I always am able to click close. However, today I'm not able to press either cancel or settings. When I do press those options, nothing happens.

I tried to turn the phone off by holding down the power button, but I'm not able to slide the arrow to turn it off. Any suggestions?

Go to the apple store and if you've perch asked this phone from the store and are the original owner and have had it for under a year they will fix it for free

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