I frequently read Bitcointalk forum in my pc, but when i enter this forum from mobile, its become little hard for me to read something. I need to rotate my phone to read.
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that helps users to read anything from the forum without zooming the page.
I don't think there will ever be a mobile application for the forum. The forum is ultimately a website, and it is fairly unusual to have mobile apps for websites.
It would probably be beneficial if different CSS styling was used when a small screen is detected. Or a m.bitconitalk.org domain could be used that serves pages with different CSS styling, such as larger fonts, or other customizations.