Depending on the type of smartphone or tablet you own, the chances are you’ll stick to one voice assistant app for answering your questions. If you have an Android, you’ll use Google Now. If you have an iPhone, you’ll use Siri. And if you have a Windows Phone, you’ll use the recently released Cortana. They’re all programmed to answer your questions as quickly and helpfully as possible, but which one of them is the best?
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