The iPhone 4S was the product that first introduced the Siri voice assistant. The iPhone 4S was designed around a stainless-steel body with a glass front and back. It had a 3.5-inch LED-backlit 960×640 326 ppi multi-touch Retina display and included two noise-cancelling microphones. It was available in black or white.
The iPhone 4S supported both GSM and CDMA networks and included 802.11b/g/n and Bluetooth 4.0. It used a dual-core Apple A5 processor; 512 MB of RAM; and 8 GB, 16 GB, 32 GB, or 64 GB of internal storage. It had two cameras: an 8 megapixel HD camera (1080p at 30 FPS) with an LED flash on the rear and FaceTime camera on the front that allowed FaceTime video calls over Wi-Fi.
This particular iPhone 7 Plus model was used with an AT&T network in the United States. All iPhone 7 Plus models used a 5.5-inch widescreen multitouch Retina HD display at 1920×1080 (401 ppi). It used a taptic-engine that provided a clickless Home button. The iPhone 7 Plus used three cameras: two rear 12-megapixel cameras (one with a wide-angle and one with a 2x telephoto lens) and a front FaceTime HD camera (7 megapixels and 1080p).
The iPhone 7 Plus was originally available in five color options: silver (white glass front and a silver back), gold (white glass front and a gold back), rose gold (white glass front and a pink-tinted gold back), black (black glass front and a matte black back), and jet black (black glass front and a high-gloss anodized and polished black aluminum back). On March 21, 2017, Apple added a (PRODUCT) RED Special Edition with a white glass front and a red aluminum back.
The iPhone 7 Plus was splash, water, and dust-resistant (but not waterproof). It had a Lightning port, but lacked a headphone jack.
Internally, the iPhone 7 Plus used a 64-bit Apple A10 Fusion processor with four cores; 3 GB of RAM; and 32, 128, or 256 GB of storage. It supported 802.11a/b/g/n/ac Wi-Fi, Bluetooth 4.2, LTE (4G), and NFC for Apple Pay.
This particular iPhone 6 model was used an AT&T network (and functioned throughout North America). All iPhone 6 models had a 4.7-inch multi-touch screen at 1334×750 (326 ppi, Retina HD display). It had two cameras: a rear 8 megapixel iSight camera (1080p) and a front 1.2 megapixel FaceTime camera (720p).
The iPhone 6 was originally available in three color options: silver (white glass front and a silver aluminum back), gold (white glass front and a gold aluminum back), and space gray (black glass front and a medium-gray aluminum back). The iPhone used a unibody design with rounded sides (similar to the iPod touch Generation 5). The glass screen curved slightly at the edges. It also included a Touch ID fingerprint sensor.
The iPhone 6 used a 1.4 GHz 64-bit Apple A8 processor with 1 GB of RAM and 16, 32, 64, or 128 GB of storage. In addition to 802.11a/b/g/n/ac Wi-Fi, Bluetooth 4.0/4.2, and LTE (4G), it included NFC for Apple Pay transactions. It had both a bottom-mounted headphone jack and a Lightning port.
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.
The iPhone 3G is similar to the original iPhone in functionality, but adds 3G cellular support and GPS. Although it features the same 320×480 resolution screen, the case is slightly thicker (0.02-inch) than the original, and had a plastic (rather than aluminum) back available in black or white. Both models were available in 8 GB or 16 GB, but the white iPhone 3G was only available in 8 GB.
The GPS functionality allowed the 2.0 megapixel camera to supports geotagging. The iPhone 3G uses the same multi-touch interface, accelerometer, ambient light sensor, and proximity sensor capabilities as the original iPhone, except it has two proximity sensors compared to one in the original.
The back of the iPhone 3G has the most curved shape of any iPhone design to date, and has been the only “flagship” iPhone model to ship with a plastic back.
iPhone 3GS looks nearly identical to the iPhone 3G that preceded it. The only obvious visual difference is that the markings on the back of the phone are printed with a heavier weight font and a more reflective silver ink than the iPhone 3G.
The iPhone 3GS has many feature changes. The screen added a new “oleophobic” oil repellent coating. The “S” added to the name might refer to its increased speed: the processor increased from 412 MHz to 600 MHz, the onboard RAM doubled to 256MB, and the cellular network speed increased to 7.2 Mbps. The camera was also upgraded to 3.0 megapixel with VGA video recording at 30 FPS, as well as autofocus, macro, and white balance support, a tap to focus feature, and the ability to trim videos. The iPhone 3GS also added a compass.
Several new accessibility features were added, including VoiceOver, voice control, integrated Nike+iPod support, and an inline remote on the headphone cable, all features that had been previously added to iPod shuffle Generation 3.
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.
The original iPhone was officially announced on January 9, 2007, and was released on June 29, 2007. The original iPhone was available in 4, and 8 GB capacities, with a 16 GB capacity released on February 5, 2008. Soon after the original release, Apple dropped iPhone prices by $100. As a concession to early adopters (after criticism), Apple offered a $100 store credit. I used my store credit to purchase the $99 Apple Bluetooth Headset.
The original iPhone introduced the “multi-touch” display that allowed control by dragging one or more fingers across the glass display, although no interface controls required multiple fingers in the iPhone OS 1.0. This iPhone has sensors including an accelerometer (to detect landscape or portrait orientation), an ambient light sensor (to control screen brightness), and a proximity sensor (to turn off the display when held to the ear).
Other features include Wi-Fi (802.11b/g), EDGE, Bluetooth 2.0, and a 2.0 megapixel camera. The case is 2.4 inches by 4.5 inches, is 0.46-inch thick, and weighs 4.8 ounces.
Source: EveryMac.com and AppleInsider.