After celebrating the arrival of the "iPhone 15" with excitement and long lines outside stores, negative aspects began to emerge as users reported changes in the color of the titanium material used in the phone upon touch, which raised their concerns. Users complained that the color change of the phone's metallic frame primarily occurs around the corners and edges. They also noted that the issue appears to be more prevalent in the "iPhone 15 Pro" models in gray. However, some Apple defenders explained that the discoloration of the metallic frame is not due to damage or scratches but rather a chemical reaction between the metal and the chemicals found in human skin or in perfumes and shampoos.