As of this writing, the Apache Cordova web site lists that it supports Google Android, Samsung bada, BlackBerry, Apple iOS, Palm WebOS, Symbian, and Microsoft Windows Phone platforms. The Cordova download contains folders for Android, BlackBerry, Firefox OS, iOS, Windows Phone 8, Windows 7, and Windows 8. Support for other operating systems is available through separate downloads.
Support for other mobile device platforms is available but through separate downloads, typically from GitHub. It appears from the traffic on the Cordova dev lists that support for other platforms, such as Amazon Fire OS and Ubuntu, is under development as well.
As you can see, the list of supported platforms is broad, but only a few are really popular. For this book, I cover primarily Android and iOS, plus some others that I find interesting such as Windows Phone 8 and Firefox OS.