The iPhone 5 brought about some exciting upgrades with its spectacular redesign. For one, it is the first iPhone to employ a 4" screen. Other notable upgrades are the A6 chip twice as fast as the A5, the first Apple phone to have 1GB of RAM, and it's beautiful new two toned look.

The iPhone 4S, the successor of the iPhone 4 brings many improvements over the revolutionary remodeled device. Keeping the same design and improving only in features alone it brings Siri, the speedy A5 chip and a 1080, 5MP camera. It also fixes some of the 4's mistakes like the antennagate issue.

The iPhone 4 was the first big redesign of the iPhone, so much so that Apple marketed it as saying- "This changes everything, again". Contained in it's brand new square design is the beautiful Retina Display, a 5MP camera with 720p video, 3-axis gyro and the A4 chip.

The iPhone 3GS was the first example of the two year release cycle that Apple currently employs with iOS devices. This was a speedbump upgrade but was still a great buy, with a faster processor and internet, a 3MP camera and voice control.

The iPhone 3G intruduced 3G for the first time on an iPhone (duh). It also got rid of the cheap-looking black bar on the back of the device. The first truly beautiful iPhone design also came with a digital compass and a more powerful processor. Also being the first iPhone with a video camera, GPS and 3G.

The iPhone 2G is what started it all, before this device phones had more buttons than screenspace. It was the phone that revelutionised the industry, bringing the first Multi-Touch display, 2G internet, the iOS that started it all, it was thin, light and easier to use than ever.