Update:

Who knew today was Spanish April Fool’s day. Grrrrr!Alpha CortanaWe just came to understand that Microsoft has made “Hey Cortana” an OS wide feature in Windows 10 via the leaked Build 9901. This also raised the hope of more devices having this feature with Windows 10 Phone. Now it seems, even Windows Phone 8.1 GDR2 will bring more advanced Hey Cortana with it.

A video posted by “Windowsphoneapps.es” demos how a GDR2 or more advanced Windows Phone 8.1 Build running Lumia 930 can be switched on by just saying “Hey Cortana“.

Via: WPA