<P> The iPhone 6 and 6 Plus received positive reviews, with critics regarding their improved design, specifications, camera, and battery life as being improvements over previous iPhone models . However, aspects of the design of iPhone 6 were also panned, including plastic strips on the rear of the device for its antenna that disrupted the otherwise metal exterior, and the screen resolution of the standard - sized iPhone 6 being lower than other devices in its class . Pre-orders of the iPhone 6 and iPhone 6 Plus exceeded four million within its first 24 hours of availability--an Apple record . More than ten million iPhone 6 and iPhone 6 Plus devices were sold in the first three days, another Apple record . During its lifespan, the iPhone 6 and 6 Plus sold 220 million in total, making them the best selling iPhone models, so far, and one of the most successful phones to date . </P> <P> Despite their positive reception, the iPhone 6 and 6 Plus have been the subject of several hardware issues, including most prominently, being susceptible to bending under pressure, such as in a pocket . The iPhone 6s and 6s Plus were made with 7000 series aluminum (a design flaw nicknamed "Bendgate"), and as a byproduct of this lack of rigidity, the touchscreen's internal hardware being susceptible to losing its connection to the phone's logic board (nicknamed "Touch Disease"). The iPhone 6 Plus was also the subject of camera issues, including some devices with malfunctioning optical image stabilization or otherwise defects on rear cameras . </P> <P> The iPhone 6 and 6 Plus were moved to the midrange spot in Apple's iPhone lineup when the iPhone 6S and 6S Plus were released in September 2015 . The iPhone 6 and 6 Plus were discontinued in most countries on September 7, 2016 when Apple announced the iPhone 7 and iPhone 7 Plus . Their spot as the entry - level iPhone was replaced by the iPhone SE, which was released earlier on March 31, 2016 . The iPhone 6 was relaunched with 32 GB of storage in Asian markets in February 2017 as a midrange / budget iPhone . It was later expanded to Europe, before hitting the US markets in May 2017, and Canada in July 2017 . </P> <P> From the launch of the original iPhone to the iPhone 4S, iPhones used 3.5 - inch displays--which are smaller than screens used by flagship phones from competitors . The iPhone 5 and its immediate successors featured a display that was taller, but the same width as prior models, measuring at 4 inches diagonally . Following Apple's loss in smartphone market share to companies producing phones with larger displays, reports as early as January 2014 suggested that Apple was preparing to launch new iPhone models with larger, 4.7 - inch and 5.5 - inch displays . Reports prior to its unveiling also speculated that Apple might use a new iPhone model to introduce a mobile payments platform using near - field communications--a technology that has been incorporated into many Android phones, but has experienced a low adoption rate among users . </P>

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