ay Services isn’t an app, so much as underlying software that a lot of other apps rely upon. th the leap to 5.0, adds the necessary support for Android ar, the Quests Saved Games updates for ay Games, closed-captioning on Cast (the media service used by Chromecast). Here’s what the latest ay Services includes the following: The most notable interesting for the end user will likely be the introduction of Android ar services, which allow apps to talk to wearable devices. You’ll need this update before your fancy new Android ar watch will work. The update is rolling out now, but it can take several days before it shows up on your phone.