I can't unlock my iphone 4

I was playing around with my settings, and I think i turned on voiceover… Or something like that. Then my phone started talking to me and it freaked me out, so I did what any sane person would do and I pressed the power button. That stopped the phone from talking to me, but when I tried to unlock it again there was a grey box in the upper left hand corner and my touchscreen wouldn't work… So I can't unlock my phone. If anybody with an iphone thinks they have any idea what's going on can you Please help me?

Wej kan not open my iphone

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