When Steve Jobs' Apple first iPhone was released on January 9th 2007, setting the tone for the next decades to come regarding what a mobile phone should be. With its touch screen, its sleek design, and its App Marketplace, it re-imagined what the typical mobile experience should be. Almost 15 years later with more than 2.2 billion iPhones being sold, it truly paved the way for the future.

To this day the iPhone is one of the biggest platforms for smartphones, competing alongside Android. However, Apple has built itself a reputation for providing quality products with hefty price tags, therefore giving it a semblance of luxury. While the first iPhone only had one camera, the latest versions come with a multitude of them, to indulge our addictions with social media.

But how much do you really know about iPhones and their past? We're sure that you'd be surprised to learn some new and interesting facts you'd never even thought to ask yourself, like which was the first iPhone model to include fingerprint unlocking, or what does the "i" in iPhone stand for? Test your knowledge and encourage your friends to try and beat your score!