In early 2009, choosing a mobile phone that ran the Google Android operating system was easy. That's because there was only one, the HTC Dream. Just a year on, the situation is very different, with devices from almost all the major handset manufacturers. In fact, you have only to look at the announcements coming out of this week's Mobile World Congress in Barcelona to see how popular Android has become. In this article, we'll give you a brand-by-brand breakdown of the new smartphones. Read on if you are planning to switch to Android in 2010 and need to narrow down your choices.