After updating your Health app, you'll be able bark voice commands on the Band's mic without having to touch your phone and get instant notifications. ​According to The Digital Lifestyle, though, you have to be in the US (due to the app's limited availability) and have Cortana for Android installed on your phone to be able to use the feature. You can read the application's change log on Google Play, which also lists the ability to create challenges for everyone in your friends' circle who has the wearable.