ware for mobile phones. After the acquisition, Google along with Android collaborated on the development of a Linux-based mobile device OS. The efforts resulted in the development of Android, a mobile software platform based on Linux kernel. Since October 21, 2008, Android is available as open source. Google released most of the Android code under the Apache license, a free software and open source license. It allows developers to write codes in Java programming language, controlling the device via Google-developed Java libraries. Android 2 Cascading Style Sheets (CSS) is a style sheet language used to describe the presentation (that is, the look and formatting) of a document written in a markup language. Smart Wireless Devices support a number of radio access technologies namely GSM/EDGE, UMTS, Bluetooth and Wi-Fi. Unlike, Symbian it also supports CDMA and EV-DO radios. The Android Software Development Kit includes a comprehensive set of development tools including a device emulator, a debugger, libraries, sample code, tutorials and a plug-in for the Eclipse IDE (integrated development environment). Similar to the App Store on the iPhone, the Android Market is a catalog of applications that can be downloaded and installed to target hardware over-the-air without the use of a PC. Google supports both freeware and paid applications. The key Android-based phones are: The HTC Dream was the first phone to hit the market that uses the Android platform. The phone is part of the open standards effort of the Open Handset Alliance. It was first released in the US on October 22, 2008 and later in the other parts of the world. Sciphone Dream G2 is available only in the Chinese online market. Haier Mobile announced an Andriod smartphone on February 2009 during the annual GSMA Congress. 10.3.7 Linux Linux operating system was developed by Linux Tovalds in 1991 and currently can be found in about 5-6% of the mobile devices around the world. Embedded Linux prescribes the use of a Linux operating system in mobile phones, personal