If Theme Options Mobile Switcher detects a mobile a device, a global define will be set, and can be used as follows:

if(IS_MOBILE_DEVICE) {
    //its a mobile device!
}

If someone is having trouble viewing your site, you can force them to view the site in either mobile mode, or full mode, or reset it back to detection of the device. you can do that by simply adding these to the end of the url:

?site=full - Full Site

?site=mobile - Mobile Site

?site=unset - Reset the detection to automatic