So does Samsung phone glass. Any glass breaks, if you drop it enough. Both iPhones and Samsung use the latest, toughest Corning Gorilla Glass. . . same glass. Apple has been using Gorilla glass since the very first iPhone back in 2007.
In fact it was Steve Jobs who found a use for Corning's up-to-then useless product. Apple has not changed to a different supplier other than Corning for their iPhone and iPad screens, although they were exploring using sapphire in place of Gorilla glass several years ago, but the 450 pound sapphire boules needed to be successfully grown at a 90% or better rate, and instead they were getting a 90% failure rate when the boules cracked and shattered on cooling. Apple stayed with Corning as their cover glass supplier..
S7 edge glass is CRAZY expensive to replace... my son cracked his and was told its was about 250 to replace it. :(