From ComputerWorld: Cortana for Android users are expressing their frustration after Microsoft turned off the app's "Hey Cortana" voice activation feature on Sunday.
While reviewers are frustrated that they can't activate Microsoft's virtual assistant using just their voice, it seems that the feature's removal was actually done to mitigate a bug. According to Microsoft, when "Hey Cortana" was enabled, people were unable to use Android's systemwide voice-search feature.
In other words, people who wanted to talk to their phones using both "Ok Google" and "Hey Cortana" weren't able to. Running Google Now and Cortana side-by-side may seem strange, but Google's voice-activated search can work inside any app. There's also the matter of Cortana using Bing as its default search engine -- people who prefer to use Google for finding stuff on the Web may want to have the option of using both assistants.
Interestingly, that issue wasn't found during the beta process for Cortana on Android. Users have taken to the app's Google Play reviews page to decry its removal, with some going so far as to call it "useless" without the ability to invoke Cortana using their voices.
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