To activate this feature you will need to specify the URL of the XML feed of the Google Calendar you want to display in your mobile site. For instructions on how to locate this feed visit
https://www.google.com/support/calendar/bin/answer.py?hl=en&answer=37648
We recommend using the private XML feed to avoid issues with access permissions. It is also possible to use the public XML feed for Calendars that are Public, but not for calendars that are only shared with some users.