http://www.google.co.in/search?client=opera&rls=en&q=mobile+forum&sourceid=opera&ie=utf-8&oe=utf-8 Site : http://www.1up.in ranks 3 for "Mobile Forum" , Getting a Few Hits .
Competition of this keyword is high, but the search volume of it isn't. Wordtracker show us only 7 searches per day globally. Try to get more searchable keyword.