IPhone4
* Released in 2010.
* A4 single-core processor.
* 3.5-inch Retina display (Retina screen), 960x640 pixel resolution.
* Rear-facing camera 5 million megapixels.
* Front-facing camera 300,000 megapixels.
Iphone4s
* Released 2011
* A5 Dual-core processor.
* 3.5-inch, 960x640 pixel resolution.
* Rear-facing camera 8 million megapixels.
* Front-facing camera 300,000.
iphone5/5c
* Released in 2012.
* A6 Dual-core processor.
* 4.0-inch, 1136x640 pixel resolution.
* Rear-facing camera 8 million megapixels.
* Front-facing camera 1.2 million megapixels.
IPhone5S
* Released 2013
* A7 Dual-core processor
* 4.0-inch, 1136x640 pixel resolution
* Rear-facing camera 8 million megapixels
* Front-facing camera 1.2 million megapixels
IPhone6
* Released 2014
* A8 Dual-core processor
* Main Screen Size: 4.7 inch
* Main screen resolution: 1334x750 pixels
* Rear-facing camera: 8 million megapixels
* Front-facing camera: 1.2 million megapixels
* Memory: 1GB
IPhone6 Plus
* Released 2014
* Main screen Size: 5.5 inch
* A8 Dual-core processor
* Main screen resolution: 1920x1080 pixels
* Rear-facing camera: 8 million megapixels
* Front-facing camera: 1.2 million megapixels
* Memory: 1GB
Iphone6s
* Released 2015
* Main Screen Size: 4.7 inch
* A9 Dual-core processor
* Main screen resolution: 1334x750 pixels
* Rear-facing camera: 12 million megapixels
* Front-facing camera: 5 million megapixels
* Memory: 2GB
* Retina HD display with 3D Touch technology
Iphone6s Plus
* Released 2015
* A9 Dual-core processor
* Main screen Size: 5.5 inch
* Main screen resolution: 1920x1080 pixels
* Rear-facing camera: 12 million megapixels
* Front-facing camera: 5 million megapixels
* Memory: 2GB
* Retina HD display with 3D Touch technology
Video resolution related content:
30w=30, meaning that the camera's sensor has such a large total number of pixels.
I'll give you an approximate correspondence table.
30w=640x480, down support
100w=1024x768, down support 720x480, 640x480, etc.
130w=1280x1024 (although exceeding 720P But this is a non-standard HD resolution)
720P=1280x720 (this is the standard HD resolution, the beginner, the number of pixels 920,000)
1080P=1920x1080 (This is the standard full HD, pixel number 2 million or so)
iOS Apple Phone Hardware summary