title: How google Analytics detect android device
body: <p>I know GA using UserAgent string to detect device id or brand name for an android device. But i wonder do Google using <a href="http://wurfl.sourceforge.net/" rel="nofollow">WURLF library</a> or they building and device's useragent database for themselves.</p>
  
  <p>Because our company has an android device that update user agent to  WURLF  but in GA, it's still not set.</p>