More importantly, the tipster claims Apple is scaling up the vapor chamber cooling system introduced in the iPhone 17 Pro. Apple first brought vapor chamber cooling to the iPhone with the iPhone 17 Pro in September 2025. Every credible leak so far describes the iPhone 20 as a glass-heavy, ultra-thin device with curved surfaces on all four edges. FAQsWill the iPhone 20 have better cooling than the iPhone 17 Pro? While exact dimensions have not been leaked, the iPhone 20 is rumored to match the iPhone Air’s slim profile, which currently measures 5.6mm thick.