The first public release of Android 1.0 occurred with the release of the T-Mobile G1 (aka HTC Dream) in October 2008.
Both the operating system itself and the SDK were released along with their source code, as free software under the Apache License. These releases were done through software emulation as physical devices did not exist to test the operating system. Several public beta versions of the SDK were released.
The beta was released on November 5, 2007, while the software development kit (SDK) was released on November 12, 2007. There were at least two internal releases of the software inside Google and the Open Handset Alliance (OHA) before the beta version was released. The development of Android started in 2003 by Android, Inc., which was purchased by Google in 2005.
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