White green line on phone
Is there a way to get rid of this light green/ white transparent line in the middle of my iPhone XR
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Coloured lines on the screen are almost always hardware failure.
You should arrange a repair
https://support.apple.com/iphone/repair/service
Anything other than Screen or Battery may be a replacement phone and the price is in the article.
You can see additional service information within the following article:
Prepare your iPhone for packing and shipping