This Extension based on Mobile_Detect class writed by Serban Ghita and Victor Stanciu
In app config:
'components'=>array(
...
'mobileDetect' => array(
'class' => 'ext.MobileDetect.MobileDetect'
),
...
); $detect = Yii::app()->mobileDetect;
// call methods
$detect->isMobile();
$detect->isTablet();
$detect->isIphone();
...