Two South Korean search portals (NHN Corp./Naver and Daum Communications Corp.) filed complaints against Google in April 2011 with South Korea's Fair Trade Commission (KFTC), alleging that Google is abusing the dominance of its Android smartphone platform to stifle and restrict competition in the mobile search market.  The complainants allege that Google is restricting local mobile service providers and Android smartphone manufacturers from preloading smartphones with rival mobile search applications.  The companies have asked the KFTC to determine whether such a restriction constitutes an unfair business practice.