No. There are a lot of threads in Meta asking about tappatalk though it seems. I believe the new forum software that is being created will support mobile devices, but don't quote me on that.
I wouldn't download any of that crap. You never know whose software it is, and to me this is how people get their bitcointalk accounts hacked. As of right now, a mobile site/app doesn't exist.
That's the worst friggin' thing about this forum, the lack of mobile friendliness. Everything else I absolutely love (except the trust system). It's intuitive and really easy to use. Unfortunately when using a smartphone it's hard for me to type. I have thumbs like big wet potatoes and thus make many mistakes and it's a pain in the ass. Don't know why, with all those donations, bct can't be mobile-friendly. However, I have to say that I'm just glad this forum exists. I like it, warts and all and don't really have a right to complain--it isn't my forum.