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iPhone
Access to the internet on a screen that you could actually see it on; phone with a camera. -
iPhone 3g
iPhone had an app store now; iPhone was also capable of 3g connectivity [better internet access]. -
iPhone 4s
The camera went from 5 MP to 8 MP; 1080 pixel video recording; Siri was also introduced. -
iPhone 8
Wireless charging; true tone display improved viewing by automatically reducing blue-light exposure -
iPhone SE second generation
Basically an iPhone 8 with iPhone 11 specs, such as an A13 chip, an advanced camera system, and high-quality video