Why my screen iphone don't work well?

Why my iphon's screen don't work well?

Two things to try:
First, reset the phone by holding the sleep and home button until the Apple logo comes back again. You will not lose data by resetting.
If this does not work, set it up as new device, explained in this article:
How to back up your data and set up as a new device
If still no luck, your hardware might be damaged and the phone has to be serviced.
iPhone - Contact Support - Apple Support

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