A history of the Apple iPhone and its evolution.

Original iPhone

Body
Dimensions:: 115.5 x 61 x 11.6 mm
Weight: 135 g (4.76 oz)

Display
Type:: TFT capacitive touchscreen, 16M colors
Size:: 3.5 inches (~50.9% screen-to-body ratio)
Resolution:: 320 x 480 pixels (~165 ppi pixel density)

Hardware
CPU:: 412 MHz ARM 11
GPU:: PowerVR MBX
Internal Memory:: 8/16 GB, 128 MB RAM

Camera
Primary:: 2 MP, 1600 x 1200 pixels

Specifications:
iPhone

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What we want to do is make a leapfrog product that is way smarter than any mobile device has ever been, and super-easy to use. This is what iPhone is. OK? So, we're going to reinvent the phone. Steve Jobs, 2007

iPhone 3G

Body
Dimensions: 115.5 x 62.1 x 12.3 mm
Weight: 133 g (4.69 oz)

Display
Type: TFT capacitive touchscreen, 16M colors
Size: 3.5 inches (~50.9% screen-to-body ratio)
Resolution: 320 x 480 pixels (~165 ppi pixel density)

Hardware
CPU: 412 MHz ARM 11
GPU: PowerVR MBX
Memory Internal: 8/16 GB, 128 MB RAM

Camera
Primary: 2 MP, 1600 x 1200 pixels

Specifications:
iPhone 3G
Choose phone colour
An iPod, a phone, an internet mobile communicator… An iPod, a phone, an internet mobile communicator… An iPod, a phone, an internet mobile communicator… Do you get it? These are not three separated devices. This is one device, and we are calling it iPhone. Steve Jobs, 2007

iPhone 4

Specifications:

Body
Dimensions: 115.2 x 58.6 x 9.3 mm
Weight: 140 g (4.94 oz)

Display
Type: LED-backlit IPS LCD
Size: 3.5 inches (~54.0% screen-to-body ratio)
Resolution: 640 x 960 pixels (~330 ppi pixel density)

Hardware
CPU: Dual-core 1 GHz Cortex-A9
GPU: PowerVR SGX543MP2
Internal: 8/16/32/64 GB, 512 MB RAM

Camera
Primary: 8 MP, 3264 x 2448 pixels
Secondary: VGA, 480p@30fps
Video: 1080p@30fps

iPhone 4
Choose phone colour
We love our users so much that we built 300 Apple retail stores for them to give them the best buying experience in the world." Steve Jobs, 2010

iPhone 5

Specifications:

Body
Dimensions: 123.8 x 58.6 x 7.6 mm
Weight: 112 g (3.95 oz)

Display
Type: LED-backlit IPS LCD
Size: 4.0 inches
Resolution: 640 x 1136 pixels (~326 ppi pixel density)

Hardware
CPU: Dual-core 1.3 GHz Swift (ARM v7-based)
GPU: PowerVR SGX 543MP3 (triple-core graphics)
Internal: 16/32/64 GB, 1 GB RAM

Camera
Primary: 8 MP, 3264 x 2448 pixels
Secondary: 1.2 MP, 720p@30fps
Video: 1080p@30fps

iPhone 5
Choose phone colour
Uber is efficiency with elegance on top. That's why I buy an iPhone instead of an average cell phone, why I go to a nice restaurant and pay a little bit more. It's for the experience. Travis Kalanick

iPhone 6 

Specifications:

Body
Dimensions: 138.1 x 67 x 6.9 mm
Weight: 129 g (4.55 oz)

Display
Type: LED-backlit IPS LCD
Size: 4.7 inches
Resolution: 750 x 1334 pixels (~326 ppi pixel density)

Hardware
CPU: Dual-core 1.4 GHz Cyclone (ARM v8-based)
GPU: PowerVR GX6450 (quad-core graphics)
Internal: 16/64/128 GB, 1 GB RAM

Camera
Primary: 8 MP, 3264 x 2448 pixels
Secondary: 1.2 MP, 720p@30fps
Video: 1080p@60fps, 720p@24fps

iPhone 6
Choose phone colour
"Nobody has tried to swallow us since I've been here. I think they are afraid how we would taste." Steve Jobs, 1998