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I have noticed an issue that is pretty big where you can't click on the title of an inbox message when viewing via mobile. When trying to do so the hover remove box appears and you cannot click the title to visit the messages page.
I contacted my template provider (Joomlashine) to make sure it wasn't an issue on their end and after investigation they have reported it to be a jomsocial issue and to report it to you.
I have provided a link to a video of me showing this behaviour in action in the private details section.
Hope to get a fix asap as this is a pretty serious bug where users can't access inbox messages via mobile via regular methods.