diff --git a/helper/mobiletool.php b/helper/mobiletool.php
index 055f98d..f7afdea 100644
--- a/helper/mobiletool.php
+++ b/helper/mobiletool.php
@@ -7,57 +7,68 @@
  * @documentation https://www.w3.org/Mobile/training/device-detection/mobile_detector.txt
  */
 
-if(check_function_exists("detect_mobile")) {
-  function detect_mobile() {
-      // This function returns the value of a local variable ($mb)
-      // that is 0 if a desktop client is detected and > 0 for mobile.
-      // Adapted only very lightly from original code posted PascalV in response to 
-      // the lightweight device detection (http://mobiforge.com/developing/story/lightweight-device-detection-php)
+if(!check_function_exists("detect_mobile")) {
+    function detect_mobile() {
+        // This function returns the value of a local variable ($mb)
+        // that is 0 if a desktop client is detected and > 0 for mobile.
+        // Adapted only very lightly from original code posted PascalV in response to 
+        // the lightweight device detection (http://mobiforge.com/developing/story/lightweight-device-detection-php)
 
-      $mb = 0;
+        $mb = 0;
 
-     if(preg_match('/(up.browser|up.link|mmp|symbian|smartphone|midp|wap|phone)/i', strtolower($_SERVER['HTTP_USER_AGENT']))) {
-       $mb++;
-     }
+        if(preg_match('/(up.browser|up.link|mmp|symbian|smartphone|midp|wap|phone)/i', strtolower($_SERVER['HTTP_USER_AGENT']))) {
+            $mb++;
+        }
 
-     if((strpos(strtolower($_SERVER['HTTP_ACCEPT']),'application/vnd.wap.xhtml+xml')>0) or ((isset($_SERVER['HTTP_X_WAP_PROFILE']) or isset($_SERVER['HTTP_PROFILE'])))) {
-       $mb++;
-     }    
+        if((strpos(strtolower($_SERVER['HTTP_ACCEPT']),'application/vnd.wap.xhtml+xml') > 0) or ((isset($_SERVER['HTTP_X_WAP_PROFILE']) or isset($_SERVER['HTTP_PROFILE'])))) {
+            $mb++;
+        }    
 
-     $mobile_ua = strtolower(substr($_SERVER['HTTP_USER_AGENT'],0,4));
-     $mobile_agents = array(
-       'w3c ','acs-','alav','alca','amoi','audi','avan','benq','bird','blac',
-       'blaz','brew','cell','cldc','cmd-','dang','doco','eric','hipt','inno',
-       'ipaq','java','jigs','kddi','keji','leno','lg-c','lg-d','lg-g','lge-',
-       'maui','maxo','midp','mits','mmef','mobi','mot-','moto','mwbp','nec-',
-       'newt','noki','oper','palm','pana','pant','phil','play','port','prox',
-       'qwap','sage','sams','sany','sch-','sec-','send','seri','sgh-','shar',
-       'sie-','siem','smal','smar','sony','sph-','symb','t-mo','teli','tim-',
-       'tosh','tsm-','upg1','upsi','vk-v','voda','wap-','wapa','wapi','wapp',
-       'wapr','webc','winw','winw','xda','xda-');
+        $mobile_ua = strtolower(substr($_SERVER['HTTP_USER_AGENT'], 0, 4));
+        $mobile_agents = array(
+            'w3c ','acs-','alav','alca','amoi','audi','avan','benq','bird','blac',
+            'blaz','brew','cell','cldc','cmd-','dang','doco','eric','hipt','inno',
+            'ipaq','java','jigs','kddi','keji','leno','lg-c','lg-d','lg-g','lge-',
+            'maui','maxo','midp','mits','mmef','mobi','mot-','moto','mwbp','nec-',
+            'newt','noki','oper','palm','pana','pant','phil','play','port','prox',
+            'qwap','sage','sams','sany','sch-','sec-','send','seri','sgh-','shar',
+            'sie-','siem','smal','smar','sony','sph-','symb','t-mo','teli','tim-',
+            'tosh','tsm-','upg1','upsi','vk-v','voda','wap-','wapa','wapi','wapp',
+            'wapr','webc','winw','winw','xda','xda-'
+        );
 
-     if(in_array($mobile_ua,$mobile_agents)) {
-       $mb++;
-     }
+        if(in_array($mobile_ua, $mobile_agents)) {
+            $mb++;
+        }
 
-     if (strpos(strtolower($_SERVER['ALL_HTTP']),'operamini')>0) {
-       $mb++;
-     }
+        if(strpos(strtolower($_SERVER['ALL_HTTP']),'operamini') > 0) {
+            $mb++;
+        }
 
-     if (strpos(strtolower($_SERVER['HTTP_USER_AGENT']),' ppc;')>0) {
-       $mb++;
-     }
+        if(strpos(strtolower($_SERVER['HTTP_USER_AGENT']),' ppc;') > 0) {
+            $mb++;
+        }
 
-     if (strpos(strtolower($_SERVER['HTTP_USER_AGENT']),'windows ce')>0) {
-       $mb++;
-     } else if (strpos(strtolower($_SERVER['HTTP_USER_AGENT']),'windows')>0) {
-       $mb=0;
-     }
+        if(strpos(strtolower($_SERVER['HTTP_USER_AGENT']), 'windows ce') > 0) {
+            $mb++;
+        } elseif(strpos(strtolower($_SERVER['HTTP_USER_AGENT']), 'windows') > 0) {
+            $mb = 0;
+        }
 
-     if (strpos(strtolower($_SERVER['HTTP_USER_AGENT']),'iemobile')>0) {
-       $mb++;
-     }
+        if(strpos(strtolower($_SERVER['HTTP_USER_AGENT']), 'iemobile') > 0) {
+            $mb++;
+        }
 
-     return $mb;
-   }
- }
+        // detect android os
+        if(strpos(strtolower($_SERVER['HTTP_USER_AGENT']), 'android') > 0) {
+            $mb++;
+        }
+
+        // detect tizen os
+        if(strpos(strtolower($_SERVER['HTTP_USER_AGENT']), 'tizen') > 0) {
+            $mb++;
+        }
+
+        return $mb;
+    }
+}