In the Google developer console it says "Google Play game services let you add social gaming features to your games on Android, iOS and the web."
So I am assuming it works on windows phone and blackberry? Has anybody tried?
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Nevermind... the plugin doesn't work for mobile platforms yet...
Unfortunately at this time Google Play Game Services only work from a web browser. It does not currently work from Crosswalk or any non-browser wrappers like CocoonJS or Ejecta. However it should still work on mobile browsers such as Chrome for Android. ~ https://www.scirra.com/manual/175/google-play
Also it may not even work for web since it requires a 'secret' now as well.