I have this redirect link, www.example.com/redirect which identifies if the mobile device is iOS or Android, after that it redirects to different links based on the device. I have tried different methods found in this forum but it never worked.
Below is the latest code I've tried:
<script>
$(document).ready(function(){
function getMobileOperatingSystem() {
  var userAgent = navigator.userAgent || navigator.vendor || window.opera;
      // Windows Phone must come first because its UA also contains "Android"
    if (/android/i.test(userAgent)) {
        return "Android";
    }
    // iOS detection from: http://stackoverflow.com/a/9039885/177710
    if (/iPad|iPhone|iPod/.test(userAgent) && !window.MSStream) {
        return "iOS";
    }
}
    function DetectAndServe(){
if (getMobileOperatingSystem() == "Android") {
     ga('send', 'pageview', {
            'page': '/33red33',
            'hitCallback': function() {
              window.location.href = 'http://android.com';
           }
           });           
    }
if (getMobileOperatingSystem() == "iOS") {
      ga('send', 'pageview', {
            'page': '/33red33',
            'hitCallback': function() {
            window.location.href = 'http://apple.com';
           }
           }); 
    }
};
});
</script>