Mobile phones that pushed our buttons: From the 1980s 'brick' to the Galaxy S4

Mobile phones have changed a great deal since Martin Cooper made the world's first mobile phone call. From cumbersome devices popular with yuppies in the 1980s to the sleek, lightweight designs produced today - innovative technology has transformed mobile phones. The first mobile phone call was made 40 years ago but now the gadgets do more than just call. The £800 billion industry now allows users to access the internet, listen to music, record videos and more. Take a look at this set of innovative handsets that changed the industry.