The iPhone 15 currently has the toughest glass on any iPhone yet, as per the company. The Ceramic Shield it uses is a glass-ceramic material Corning developed in collaboration with Apple. It looks like this is going to get an upgrade with the iPhone 17 series next year. There's no word on the durability of the iPhone 16 though, and it might just come with the same protective glass as the iPhone 15.
When it comes to Corning's tough glasses for smartphones, the Galaxy S24 Ultra stands out for its Gorilla Glass Armor. This glass panel is said to reduce reflections by 75 percent and also offers 4x more scratch resistance than other smartphone glasses.
Corning might be developing something similar for Apple or it could use Gorilla Glass Armor on the iPhone 17 too. It's still too early though since the iPhone 17 is due next year. But we should get to know more about it soon.