In a nutshell:
The LG Optimus One is a budget smartphone running Android 2.2 (Froyo). It ticks all the smartphone boxes, but compromises on most features. But for £15 a month on contract, you'll get a modern smartphone with great apps, full web functionality and brilliant satellite navigation. You'll get a music player, an FM radio, a very basic camera, fantastic battery life and great connectivity. It can't compete with the high-end Android phones, but it blows them out of the water when it comes to price.