Hi Vince,
Sorry for the delay. WP OAuth Server doe support mobile authentication. WP OAuth Server supports all OAuth grant types making is work for just about any for of programing/development language as long as the client supports HTTPS calls.
I personally use WP OAuth Server and the User Credential grant type to authorize with native mobile languages. WE are working to provide better documentation and video walk throughs to help users better understand how WP OAuth Server can be used as well as give the public a better understanding of OAuth in general.
Hope that helps. Please let me know if you need to know anything else!