No, you wont get banned because It's not against the rules to login from different IP's or have multiple accounts. I never tried browsing through smartphone but why we need app for this If you can browse with smartphone already?
Why do any websites need apps? It's just an awkward and uncomfortable experience and apps make it so much more usable. Full websites/forums just aren't made for viewing on mobile devices. I only make the occasional post from my phone when I'm not at my comp or can't be bothered turning it on etc, but I'd love an app that streamlined the whole experience.
