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it there is app available for microsoft comunity on mobile?
Yes. It is called a Web browser, with which you can navigate to the community forums website.
If you have meant a native app, there is no such thing.
I was told at some point that a mobile app was being developed, but it clearly didn't materialized.
Note that this site is based on Telligent Community, which has some support for creating mobile apps, therefore creating it (at least in theory) shouldn't be too complicated.
Unfortunately, we do not have an app for the Dynamics Community, but love the suggestion! We will add it to our list of possible future site enhancements. If it is something we decide to implement it probably will not be until Q3/Q4 FY17.