The iPhone 17 Pro, which Apple released in September 2025 starting at $1,099, is now the device most demanding iPhone users carry — and the reference target most mobile developers should be testing against. Nearly a year on, it is a clearer story than it looked at launch: a thermal and performance rethink wrapped in a material Apple abandoned two generations ago. Aluminum is back — and it is the point The headline hardware change is that Apple moved the Pro back to an aluminum unibody , away from the titanium of recent years. That sounds like a step down until you understand why: aluminum is lighter than titanium and disperses heat better. Apple laser-welded a vapor chamber into that aluminum frame, and the result is what the company calls its best-ever sustained performance and “an enormous leap in battery life.” For anyone who has watched an iPhone throttle during a long export, a heavy game, or an on-device AI task, this is the meaningful change. Peak benchmarks matter less than...