Bottom part of iPhone 4s ios7 doesn't work?

Bottom part of my iphone 4s ios 7 screen isn't working, When ever I slide to unlock the phone I can't press the cancel or emergency option on the keypad of the pass code
Or whenever I click chat an go to type something it doesn't wanna open up.

Try restoring iOS in iTunes. Sounds like a weird glitch in the OS. If that doesn't work there could be something wrong with the touch screen sensors.

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