Virtual Reality & Augmented Reality

iPhone 4S: October 14, 2011
Talk about a huge difference between the iPhone 4 and the iPhone 4S: the camera went from 5 MP to a whopping 8 MP. Now, that’s an upgrade. Apple also introduced the 64 GB storage option but kept the memory at 512 MB. Video could then be recorded in 1080p. Oh, I can’t forget—hello, Siri! Apple sold four million units of the iPhone 4S in its first week.
iPhone 5: September 21, 2012
Apple sold 5 million units of the iPhone 5 in its first week. The camera stayed the same but memory was boosted all the way up to 1 GB. You thought 3G was cool? Psh, the iPhone 5 had LTE connectivity. Hello, internet everywhere! Apple also introduced the Lightning connector with the iPhone 5. And for the first time, the screen got bigger! All previous generations' displays were 3.5 inches, but the iPhone 5 was 4 inches.
iPhone 5s & iPhone 5c: September 20, 2013
Between the iPhone 5s and the iPhone 5c, Apple sold nine million units in the first week of sales. The iPhone 5c was meant to be slightly more affordable and had a plastic shell. It was available in four different colors, but not too much else was different. The iPhone 5s, on the other hand, introduced Touch ID, dual flash, and slow-motion video. Plus, it included the M7 motion coprocessor, which opened a new realm of possibilities and also helped save battery life.
iPhone 6 & 6 Plus: September 19, 2014
Apple tends to make larger leaps between the original model and the S edition than it does from the S edition to a new model. The iPhone 6's internal specs were very similar to those of the iPhone 5s. The biggest difference was having a significantly larger screen and offering an even larger size called 6 Plus. The Retina display became HD, and the option to get an iPhone with 128 GB of storage became available. But the amount of memory was the same, and the camera didn't see a megapixel upgrade. But it didn't matter—Apple sold 10 million units in the first week.

iPhone SE: March 31, 2016

Don’t think I’ve forgotten the iPhone SE. It had all the awesome internal specs of the iPhone 6s in a small package and without 3D Touch. But overall, the iPhone SE was introduced as a more affordable option that people really loved.
iPhone 7 & 7 Plus: September 16, 2016
Apple finally dropped the 16 GB base model option, with iPhone 7 and iPhone 7 Plus base models starting at 32 GB of storage and going up to 256 GB. Apple also introduced a new shiny Jet Black color. The iPhone 7 Plus proved to be more popular than previous Plus models due to its new dual camera, which made a significantly improved zoom feature possible, and Portrait mode, a software update that let iPhone 7 Plus users take impressive photos using Depth of Field. Apple introduced its wireless AirPods at the same event it announced it was eliminating the headphone jack. 
iPhone 8 & 8 Plus: Septempber 22, 2017
The iPhone 8 and 8 Plus introduced us to wireless charging with the glass cover on the back on the iPhone. The camera was awesome, with upgraded tools for editing and filtering our images. The true-tone display improved the viewing experience by automatically reducing blue-light exposure. Users eventually (mostly) got used to not having a headphone jack and began adapting to the wireless lifestyle.