The iPhone XR has a starting price that's $250 less compared to the iPhone XS, but that doesn't mean it's an inferior phone. Far from it.
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iPhone XS review: the XS and XS Max are solid updates to a winning formula - The Verge
First Look: iPhone XS and XS Max…and XR, Apple's New Star - WSJ
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iPhone XR vs iPhone XS: Which should you buy? - 9to5Mac
iPhone XS vs. XS Max vs. XR…vs. X vs. 8 vs. 7: What's the Difference? - WSJ
A Definitive Review of the iPhone XR, by Lance Ulanoff