Then and now: The iPhone has evolved quite a bit since the first-generation product.
Over the years, the design and materials used to make the iPhone has changed quite a bit, from the first aluminium model, it went to plastic, then glass then back to aluminium in the most recent models.
Here's a quick look at how the iPhone has evolved over the years. In the interests of brevity, we've skipped some models, most notably the iPhone 5c and the iPhone SE.
