As part of cases brought by the US Justice Department, both Google's search engine and parts of its advertising technology were declared illegal monopolies, too. Sundar Pichai- File image

The US Supreme Court on Monday declined to shield Google from a year-old ruling that mandates a sweeping revamp of its Android app store to unleash greater competition in a market a jury found to be an illegal monopoly.

In a brief, one-line order, the court’s refusal means Google must soon begin restructuring its Play Store, the dominant marketplace for apps on Android devices, which compete with Apple’s iPhone in the US.

As part of the lower court’s directive issued by US District Judge James Donato last October, Google is required to grant rivals access to its full catalog of Android apps and allow

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