In the beginning, Apple created the iPhone -- just "iPhone," with no number or letter designations. When it debuted in January 2007 following stratospheric hype, CNET said "the iPhone is noteworthy not for what it does, but how it does it."
With identical hardware to the iPhone 4, all the new goodies to be found on the iPhone 4S were hidden beneath the surface. CNET's review noted the "clever new software, brilliant camera, and speedy processor."
The iPhone 5C featured a more budget-friendly polycarbonate body phone. It was available for $99 or less on contract and came in five bright snappy colors. Compared with the 2012 iPhone 5, it's got more widely compatible global LTE coverage and an upgraded front-facing camera.
With both the front and rear cameras now featuring optical image stabilization, the iPhone 7 brought much improved photography capabilities, especially in low light. Bonus: water resistance and a faster processor.
Making another leap forward as a camera, the iPhone 7 Plus featured dual rear cameras with true 2x optical zoom, and software that enabled a cool portrait mode reminiscent of higher-end glass-lensed DSLRs.