Updated February 2015 for Android 5.0.2 Lollipop Congratulations If you're reading this book, you either own or are seriously thinking of buying an Android-based tablet or phone. Google's wildly popular Android operating system has passed a major milestone- it is now installed on the vast majority of portable devices and has the most third party apps (applications) by far. So if you want to have a phone or a tablet that you can customize to work your way and not be locked into a single company's idea of how things should work, Android is for you.