Javascript - mobile phone detection excluding tablets

gistfile1.js

//this 100% isnt accurate due to android browser unreliably reporting width.. use at your own risk

// Note - requires Modernizr touch detection build

    if (Modernizr.touch && window.innerWidth < 768) { 
        // mobile user (if a touch screen and the window is smaller than tablet sized)
        alert('Mobile Phone');
    }
    else { 
        alert('Desktop or Tablet Browser');
    }