It's been 15 years since Apple released its first ever iPhone, the device that redefined the mobile phone and helped make Apple one of the most valuable companies in the world. Apple's original iPhone model sold a whopping 2.2 billion units after just a year of sales, and now, 15 years later, the Cupertino firm is developing one of its numerous successors, the iPhone 14.In 15 years, the iPhone has gone from to an intriguing new contender in the consumer technology market to a device that many simply cannot live without. 'You cannot forget the first ever iPhone which changed the way we used a smartphone forever,' tech analyst Paolo Pescatore at PP Foresight told MailOnline. '15 years on, while behavioural patterns continue to change due to technological advances, we still heavily rely on the smartphone, and the iPhone's popularity is showing no signs of slowing down.'For now it is hard to see whether the iPhone will ever be replaced as it remains a key gateway to the Apple universe.

Everything is connected to the iPhone.' MailOnline has taken a look at how the iconic device has changed through the years, from a steadily growing screen to better internet connectivity and smarter cameras.  MailOnline has taken a look at how Apple's iconic iPhone has changed since the first device in 2007 (left) to the firm's most recent flagship, the iPhone 13 (right) Apple CEO Steve Jobs holds up the new iPhone that was introduced at Macworld on January 9, 2007 in San Francisco, threetwentymain California.

The device first went on sale on June 29 that year more videos

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