how can django detect user agent

how can django detect user agent - Google Search

http://stackoverflow.com/questions/2669294/how-to-detect-browser-type-in-django

You can extract that information from the request object like so:

request.META['HTTP_USER_AGENT']

http://stackoverflow.com/questions/164427/change-django-templates-based-on-user-agent

Rather than changing the template directories dynamically you could modify the request and add a value that lets your view know if the user is on an iphone or not. Then wrap render_to_response (or whatever you are using for creating HttpResponse objects) to grab the iphone version of the template instead of the standard html version if they are using an iphone.