iPhone 4 (2010)
The iPhone 4 was introduced in 2010 with an all-new style. The new style had a chrome steel frame and a screen made from alumina silicate glass (via GSM Arena). It was absolutely flat at the rear, as well as at the edges, and was one of the thinnest phones on the market around that point. The iPhone 4 looked quite elegant in the hand, and though it was initially introduced solely in black, a shade of white was later added to the assembly.
Apart from the changes in style, the phone also featured a brand-new show. iPhone 4 featured Apple's 960-by-640-pixel tissue layer display, which was out and away the most advanced Apple had placed in any iPhone (via Apple). Everything on the screen looked super sharp and crisp. Together with the show, Apple conjointly introduced a front selfie that enabled video occupation for the first time on the iPhone. The present rear camera was upgraded to five megapixels (MP) with an optical device and a 4-x zoom.
Coming to the interior specs of the phone, the iPhone 4 featured Apple's A4 chip, which made the phone implausibly quick compared to its predecessors, Apple's Notes. Together with 500 MB of RAM, multitasking is currently possible, allowing you to switch between alternative apps without closing the primary.
iPhone 4 was free on June 24, 2010, with Apple's latest version of the computer program—iOS 4—and with a brand-new storage variant of 32 GB. It was absolutely priced at $299 if purchased with a 2-year contract, or $699 full retail. The lowest price for the 16 GB version was $599 (or $199 with a 2-year contract)
iPhone 6S and 6S Plus (2015)
Apple released the "S" version of the iPhone 6 and 6 Plus in 2015 following their enormous success. The exteriors of the iPhone 6S and 6S Plus were similar to those of the previous year's models, but they had upgraded internal features and specifications, as well as a more robust construction. These new models had reinforced 7000-series aluminum for their bodies, which is similar to what is used in the aerospace industry. According to CNET, Apple claimed that the most durable glass on the market was used in the LCD Retina display.
According to Tom's Hardware, Apple's most advanced silicon, the A9, which improved CPU and GPU performance, was the foundation for both new models. 3D Touch is a ground-breaking new feature that Apple introduced in the most recent iOS 9. It was a force-sensitive mechanism that let users push down on their display with more force to activate a secondary function.
For instance, users could forcefully press the URL to view a preview of a website without opening it. Apple claims that apps that supported 3D Touch also provided a number of quick menus that could be activated by pressing the icon on the home screen.
These devices had a 12MP back-facing camera that could now record 4K videos. For better video calls and selfies, the front camera was a 5MP setup with improved low-light capabilities. The True Tone flash system and optical image stabilization for the rear were two additional features. The iPhone 6S and iPhone 6S Plus were both released on September 25, 2015, and their starting prices were $649 and $749, respectively
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