Not Enough Storage' Pop-Up on my iPhone 4S won't go away

There are two options, 'close' and 'settings'. I tried to press them and niether of them do anything and won't go away. Now my phone is locked. I can't turn my phone off, pick up calls, or even slide to turn it on. How do I make it go away?

Plug it into the computer or laptop. Reboot your iPhone. Everything will disappear, but it's better than not being able to use your iPhone.
Or take it into your carrier store and make them figure out what to do with it.don't let them charge you for it either.

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