Chinese authorities approved Google's multibillion dollar purchase of Motorola Mobility Holdings. The $12.5 billion sale is thought to be the last step for Google to begin developing its own line of smart phones.

Google announced their plans to acquire Motorola last year and regulators in both the US and Europe approved the acquisition in February. According to a Reuters report, the main condition of the deal is that Android OS stays free and open for five years.

Android is currently the top operating system for Internet-enabled smart phones. Google will now add to that substantially; it gains access to Motorola's 17,000 patents and 7,500 patent applications.