When it's Mobile Redirect setting is turned on Helios Calendar will "sniff" users' browser and attempt to determine if it is a mobile browser. If it is the user will be redirected to the Helios Calendar Mobile Site.
The criteria used to determine if the browser being used is a mobile browser works on common "keywords" present in mobile browsers User Agent string. The keyword list can be customized by editing the /events/includes/mobile/Agents.php file.
The redirect works using PHPs preg_match() function and the keyword list should be edited using standard regex formatting & metacharacters.