Google Nexus One owners have begun to receive version 2.2 of the Android software, codenamed Froyo, as an over-the-air update to their phones, Google said in a blog post.

The update will be rolled out gradually, and most Nexus One users will receive notification of it by the end of the week, Google said. A message will appear on their smartphone's notification bar, prompting them to download the update. Once downloaded, it will automatically install, according to the blog post.

Android 2.2 has a number of improvements, including the ability to turn a smartphone into a portable Wi-Fi hotspot and support for Adobe Flash within the phone's browser.

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