AFAIK, there is no such conditional by default. The closest thing you could maybe access in a template is the useragent (e.g. Mozilla Firefox) with user.useragent, depending on which template you're dealing with, but that would be an awful mess of code.
If you just want to display different templates based on whether or not the user is on a mobile device, just edit the "Default Mobile Device" theme, editable from the Settings->Style & Language Settings AdminCP panel.
-Nick, SEOvB Developer
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