OnDemand serves up a swathe of Atlassian applications as web services. If your device has a standard browser it will work with mobile devices.
I suspect you may be asking about specific plugins or clients, but you haven't told us which ones, so I can't tell you about those. (You've not even told us which parts of OnDemand you might be interested in - Jira, Confluence, Agile, etc)
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