Apple is turning back to curved edges for the sides of the iPhone 15 models while the displays themselves will remain flat and not curved.
Design
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One rumor is that Apple would increase the maximum brightness to 2,500 nits for the iPhone 15 Pro Max, which might see the largest upgrade to its display.
Display
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Apple may use a bigger Sony sensor that measures over an inch in diameter. Images should become more vivid and vibrant as a consequence.
Camera
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Expect Apple to keep with the trend it started with the iPhone 14 models last year. The basic iPhone will use the system-on-chip that powered the Pro models from last year, while the Pro models will use a more recent version of Apple's mobile silicon.
Performance
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Since Apple is said to be experimenting with a stacked battery architecture that enables higher-capacity cells to fit into the same area, all four iPhone 15 models are anticipated to include bigger batteries than their iPhone 14 counterparts.
Battery
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Regardless of the iPhone 15 model you choose, iOS 17 will already be loaded.