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On Jan. 9, during the 2007 Apple Inc. CEO Steve Jobs introduced a new product to the public that Apple had been developing for almost three years. Introducing the device as a wide-screen iPod with touch screen, a mobile phone and an Internet device, Jobs told audiences that the iPhone would “reinvent the phone”.

Jobs pointed that the same category of smartphones of the time could make calls, connect to the Internet and receive email but most of them lacked the user friendly experience.

When Jobs showed off the iPhone, functions as simple as sliding the bar to unlock the iPhone or scrolling through bands in the music function puzzled the audience.

The rest is history. The iPhone is now considered as a game changer in the market that helped Apple become one of the most valuable companies in the world.

The iPhone is the top-selling phone of all time in the U.S., Japan and other countries.

Let’s take a look at how the iPhone has evolved over the years.

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The iPhone – Released June 29, 2007

The original iPhone was a GSM phone that established the form-factor that Apple has more or less stuck with over the years. The public was puzzled by the device, resulting in future announcements and market releases to became cultural events. Apple released the original iPhone in 4GB, 8GB and 16GB models.

iPhone 3G – Released July 11, 2008

The next generation of iPhone introduced Assisted GPS and 3G connection. The biggest improvement came with the updated iOS,  which introduced App store that enabled the third-party applications to be sold and installed on the device.

iPhone 3GS – Released June 19, 2009

iPhone 3GS came with a faster processor and a higher-resolution camera that could capture 480p videos. Apple also added support for voice controls.

iPhone 4 – Released June 24, 2010

The iPhone 4 heavily improved the display capacity and introduced the phenomenon “Retina display” claiming that no pixels would be visible to the human eye. Apple also added a front-facing “selfie” camera for video calls, and upgraded the rear-facing camera to 5 megapixels and 720p video capture. Apple also introduced a new sleek design, replacing the rounded back panel with a flat surface, making the iPhone 4 the thinnest smartphone at the time. The iPhone 4 featured a stainless-steel frame and the new A4 chip, which, along with iOS 4, helped the iPhone with multitasking functions.

iPhone 4S – Released October 14, 2011

With the fifth generation, Apple upgraded the camera to 8 megapixels and 1080p video recording. Apple also upgraded the hardware to a dual-core A5 processor. The release of 4S brought along iCloud, iMessage, Notification Center, Reminders and native integration with Twitter. The iPhone 4S was the first iPhone released after Jobs’ death.

iPhone 5 – Released September 21, 2012

The iPhone 5 featured a new dual-core chip and increased the size of the display up to four inches. Apple also replaced the large 30-pin connector it had been using since before the original iPhone with a new, all-digital connector. The iPhone 5 was also given an aluminium frame, making the phone thinner and lighter than previous models. The iPhone 5 was also the first iPhone to feature LTE support.

iPhone 5C and iPhone 5S – Released September 20, 2013

The seventh generation iPhone came in two different models. The iPhone 5C is mostly the same as the iPhone 5, but features a polycarbonate back introducing vivid colours. Claimed to be an entry level iPhone, the 5C still came with a hefty price tag.

The iPhone 5S maintained the same figure as the iPhone 5, but was given a new TouchID home button with fingerprint recognition technology. Apple also updated the camera with a larger aperture and dual-LED flash, and introduced the new A7 dual-core processor, making the iPhone 5S the first smartphone with a 64-bit processor. Apple also added the M7 processor into the iPhone to handle motion data.

iPhone 6 and 6 Plus – September 19, 2014

The iPhone 6 and iPhone 6 Plus include a number of changes over their predecessor, including models with larger 4.7 and 5.5 inches (120 and 140 mm) displays, a faster processor, upgraded cameras, improved LTE and Wi-Fi connectivity and support for a near field communications-based mobile payments offering.

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.

iPhone 6s and 6s plus – September 25, 2015

Apple has revealed the iPhone 6s and iPhone 6s Plus, largely confirming the suspicions that this September announcement would be another “s” type, containing significant upgrades on the 6 series announced last year.

Tim Cook’s words “The only thing that has changed is everything” this time seems to be realistic. The improvements announced might not be that puzzling themselves, but added to the existing features, they give a quite significant competitive edge in user experience.