Evolution of the iPhone

Its touchscreen laid the foundation for more modern smartphones and the use of fingers rather than a stylus pen to navigate, something revolutionary at the time.

Came with 3G connectivity, GPS and the App Store, giving users the ability to install applications.

Has the same plastic back, but the "S" of its name is speed, because the processor speed jumped from 412 MHz to 600 MHz, and the RAM doubled to 256 MB.

The first major redesign of the handset was with this model, which featured a combination of stainless steel and glass. Highlights include: the arrival of a front camera enabling FaceTime video calls, a retina display, 5 megapixel camera with LED flash, making it possible to make videos in HD resolution.

With a design almost identical to the previous model, came the introduction of a voice assistant called Siri, the meaning of the "S" in the name.

The second major redesign of the device, now finished in aluminum, larger screen, thinner and lighter. Also changed to the new lightning connector (with only ten Pins rather than 30 of the previous model) and the redesigned earphone, the EarPod.

Came in five models with the rear made in polycarbonate and available in various colors. Colors available include green, blue, white, yellow and pink.

Available in new color options including gold, silver, and space grey. This model was the firs to introduce touch ID to the apple world.

Rounded lines, thinner and lighter. The 4.7-inch screen fits perfectly in the hand of the user. Introduction of Retina HD, which offers better picture quality in your photos, videos, apps, and games.

5.5 inches, retina display, a more curved body, a few millimeters thinner and a few grams lighter. It is a size larger than the iPhone 6.