Nico Douga for mobile phone users was announced. Since August 9, 2007, "Nico Nico Douga (RC) Mobile" has serviced mobile phones of NTT DoCoMo and au . [ 7 ] As of October 31, 2011, Nico Nico Douga has over 23,690,000 registered users, 6,870,000 mobile users and 1,390,000 premium users. [