Cortana

But seriously, it is a voice activated personal associated able to operate applications on your phone, set reminders, and search via voice queries.
 
I am using HTC 8X WIndows Phone 8. How can I use this feature please guide me...


It's only available in the US with Windows Phone 8.1. People outside the US are changing their settings to run Cortana, however Microsoft has pulled the developer preview of WP8.1 for now.

WP8.1 is supposedly going to be officially released sometime this summer, so you may have to wait until then.
 

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