This feature is evolving into something new for the iPhone Pro models.
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Every iPhone 16 looks set to get the best feature of iPhone 15 Pro — with one big change
iPhone 15 could have thinner bezels and a titanium frame - gHacks Tech News
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Apple iPhone 15 Launch Event: Four New Models Unveiled
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iOS 18 Wish List: Everything We Want Apple to Add to the iPhone at WWDC - CNET
iPhone 15 Pro and Pro Max Add Apple's Customizable Action Button - Video - CNET