It uses Cortana running on the phone itself. Band's hardware does not have Cortana.
Re:Microsoft Band
by Nicholas_C on Thursday October 30, 2014 @03:54PM
(#8535420)
With Google Now functionality this product would be killer. I really hope that's a feature.
Re:Microsoft Band
by WorldWideWayne on Thursday October 30, 2014 @01:21AM
(#8531522)
It's got a microphone and bluetooth so it might just be a software limitation. I wouldn't be surprised if Apple actually locked third parties out from using Siri like this though.
Are you saying that you want Cortana even if you're using Android or iOS? I don't think that's going to be possible.
It'd be nice if you could get Google Now on Android at least. I doubt Apple would open up Siri, though.
From the article: "Cortana: If you’re using Windows Phone 8.1, you can take notes and set reminders with your voice using Cortana personal assistant."