Portrait tablet should display as mobile or as desktop? [duplicate]

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I'm facing the following situation. I'm working on responsive views for a website (web app) that uses Boostsrap 3, and it has radical change beetween desktop and mobile view (in this last one it become a design more like a native phone app with bottom and top bar menus, etc).

The think is i'm not sure how to handle portrait tablets, researching I found that the resolution is 768x1018 aprox. But in Bootstrap3, media queries indicate <768 = mobile = xs-screens.

I want to change this media query to make 768 part of mobile to, this is a valid aproach? Is my research ok for tablets resolutions?

Thanks in advance!