Apple's iPhone turns 10

Apple is celebrating a big milestone Thursday, with its iconic iPhone turning 10 years old and evoking memories of a rocky start for the device that ended up doing most to start the smartphone revolution.

UNITED STATES (REUTERS) - The smartphone revolution started with Apple CEO Steve Jobs unveiling the first iPhone on a stage in San Francisco in January 2007.

Six months later, people across the country were lining up to get their hands on one.

In the last decade, Apple has sold more than one billion iPhones. But the revolutionary device had a rocky start.

The first iPhone, which launched without an App Store and was restricted to the AT&T network, was primitive compared to today's version.

The very concept came as a surprise to some of Apple's suppliers a decade ago and sales were sluggish.

But after a year on the market, the iPhone hit its stride when Apple introduced the App Store.

Since then, it's changed the way people function.

"The iPhone isn't going anywhere, it is a staple of how we all expect to be able to communicate in the future." said Ms Lindsey Turrentine, Editor-in-Chief, CNET.

Fans and investors are now looking forward to the iPhone 8, expected this fall.

The new version is rumoured to have 3D mapping sensors, a new display with organic LEDs and support for augmented reality apps that would merge virtual and real worlds.