By S21, last updated 4 Nov 2013
The Android operating system
Google's Android is the smartphone operating system of choice. Trampling over the likes of Symbian and Windows Phone, Android has kicked the competition into the dust, thanks to the huge Google Play resource (formerly Android Market) that rivals Apple's App Store, with tens of thousands of downloadable apps, books and movies. There are many other features that make Android top dog, including over-the-air software updates, close integration with Google tools such as Maps, Gmail, Search and Contacts, etc.
Today's best buy: Samsung Galaxy S9 64GB from Alldeal (£534.88)
November 2013 - voice commands, Emoji smiley support, full-screen album art and video, an improved phone app and Caller ID and a new Hangouts app. KitKat also includes performance enhancements.
Jelly Bean 4.3
October 2013 - Restricted profiles limit access to apps and content, at home with your family and at work. Bluetooth Smart support makes Android ready for a whole new class of mobile apps that connect to fitness sensors. Games look great thanks to the 3D realistic, high performance graphics powered by OpenGL ES 3.0.
Jelly Bean 4.2
November 2012 - An updated version of Jelly Bean has just been released, and is denoted version 4.2. Android 4.2 improves on the speed and simplicity of Android 4.1 and includes all new features – Photo Sphere and a completely redesigned camera app, new Gesture Typing keyboard, Google Now with all new cards, and much more.
Jelly Bean 4.1
Android 4.1 is nicknamed Jelly Bean. Jelly Bean brings a new keyboard, Improved speech recognition, more intelligent search and "Google Now" reminders and alerts.