https://www.cnet.com/news/report-vertical-green-line-afflicting-some-iphone-x-units/

None of the six iPhone Xs in CNET's possession -- including several purchased at retail -- exhibit the green line issue.

Apple did not immediately respond to a request for comment. This issue should be covered by the company's standard warranty, however, and owners have reported that Apple is exchanging iPhone Xs that display the green line for fresh phones.