It's been a decade since Apple launched the iPhone. To mark the occasion, we've looked back at how the iconic smartphone has changed over the past 10 years, starting with its pioneering 2007 model.

iPhone, 2007
On 9 January 2007, Apple founder Steve Jobs outlined his intent to "reinvent the phone" with the company's first iPhone model.
The phone, which was described by Apple as a "breakthrough internet communications device", combined mobile telephony, a widescreen iPod and mobile browsing. A new touch-screen user interface was developed especially for the device, which was priced at $499 (approximately ÂŁ410).

iPhone 3G, 2008
A year later, the tech giant released its follow-up to the original iPhone, which it claimed to be twice as fast as its predecessor thanks to its 3G networking capabilities. It was the first iPhone to include the App Store, and its design replaced the aluminium back of the first generation device with plastic polycarbonate. Buttons were changed from plastic to metal, and the edges of the phone were tapered.

iPhone 3GS, 2009
The 3GS, announced in June 2009, promised to be faster and more powerful than the 3G. While its design remained much the same, its new features included an autofocus camera, video recording capabilities and voice control.
The new phone also made use of cut, copy and paste functions and multimedia messaging services (MMS), and introduced Spotlight Search and a responsive landscape keyboard.

iPhone 4, 2010...