Apple Inc. rolled out its latest iPhones at an event Tuesday, banking on new materials, camera upgrades and improved performance to coax back consumers in a slumping smartphone market. The company introduced four new models, keeping pace with the past few generations: the iPhone 15, 15 Plus, 15 Pro and 15 Pro Max. Like last year, the entry-level models start at $799. The Pro version will remain $999, but the Pro Max will now start at $1,199 — up $100 from last year’s version. Advertisement The new models — especially the high-end versions — represent the first significant iPhone overhaul...