My IPhone X has a green line going from the bottom to the top
I do not know how to fix the line
iPhone X
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Sounds like a problem with your screen. Use the Get Support link at the top of the page here to contact Apple Support to start service. Alternatively, if you have an Apple Store close by, make a Genius Bar appointment to have Apple examine the device. They will explain your options. Genius Bar Reservation and Apple Support Options - Apple