[Answered ]-Mobile switching is not working in Django?

From documentation: Altering settings at runtime.

You shouldn’t alter settings in your applications at runtime.

from django.conf import settings

settings.DEBUG = True   # Don't do this!

The only place you should assign to settings is in a settings file.

I think the best way is make several settings-file:

File base_settings.py:

 ... all your settings for all sites ...

File first_site_settings.py:

from base_settings import *

SITE_ID = 1

... other settings for this site ...

File second_site_settings.py:

from base_settings import *

SITE_ID = 2

... other settings for this site ...

And run each site as a separate djano-process:

$ python mysite/manage.py runserver --settings=mysite.first_site_settings
$ python mysite/manage.py runserver --settings=mysite.second_site_settings