iPhone 4 (2010)

The iPhone 4 represented a major design leap from the previous models with an all stainless steel body, a 3.5-inch Retina display at 960×640 (326 ppi), a chemically hardened “aluminosilcate” over the front display, and the chemically hardened black glass back. A white option was announced, but did not ship for over a year after the announcement.

The iPhone 4 was the first iPhone with dual front and back cameras: a 5 megapixel HD video/still camera (720p at 30 FPS), a 5X digital zoom, and an LED flash on the rear; and a VGA-quality video/still camera on the front designed for video conferencing over Wi-Fi using FaceTime. Both cameras used noise-cancelling microphones.

The iPhone 4 was powered by an A4 processor and added additional mobile network support. It included a digital compass, GPS, an accelerometer, and a new 3-axis gyroscope.

Source: EveryMac.com

iPhone 5 (slate gray, 2012)

The iPhone 5 included a 4-inch widescreen multi-touch Retina display at 1136×640 (326 ppi); a rear 8-megapixel, 1080p iSight camera, a front 1.2-megapixel, 720p FaceTime HD camera; and 4G/LTE support. The aluminum unibody case had a glass front and came in either a dark gray slate matte back with a glossy black front or a silver matte back with a glossy white front.

The iPhone 5 uses a 1.3 GHz dual core Apple A6 processor, has 1 GB of RAM, and 16 GB, 32 GB, or 64 GB of flash storage. It also included three noise canceling microphones, a bottom-mounted headphone jack, and a new USB 2.0 Lightning port for connectivity.

Source: EveryMac.com