It should be no surprise to anyone that the iPhone 12 Pro Max has a great screen, but it looks like it might be one of the very best you can get on a smartphone.

DisplayMate (arguably the world’s leading authority on smartphone displays) has put the iPhone 12 Pro Max’s screen through a barrage of tests, and it came out the other side with an A+ score, which is the highest rating given by the site.

In fact, the iPhone 12 Pro Max matched or broke 11 display performance records on the site, suggesting that it may well have the best smartphone screen.
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https://www.techradar.com/news/iphone-12-pro-max-has-received-the-highest-screen-rating-possible-from-displaymate