JForum currently has no mobile (or responsive) version, and nothing to that effect is in the works (I'm a committer to the project, so I should know :-). If you want to start a discussion about this, head over to http://jforum.andowson.com/ where JForum2 is discussed and supported.
posted 2 years ago
thank you for your response, ia have already added there the same question but nobody replied. Let's see..I think responsive is very importrant..
posted 1 year ago
As a follow-up: the newly released JForum 2.5.0 has mobile-friendly views of a number of pages. Not exactly responsive, but better than nothing :-)