It would take six years from the launch of SMS until the first case of advertising would appear on this new data media channel, when a Finnish news provider offered free news headlines via SMS, sponsored by advertising. This led to rapid experimentation in mobile advertising and mobile marketing, and the world's first conference to discuss mobile advertising was held in London in 2000, sponsored by the Wireless Marketing Association (which later merged into the Mobile Marketing Association). The first books to discuss mobile advertising were Ahonen's M-Profits and Haig's Mobile Marketing in 2002. Several major mobile operators around the world launched their own mobile advertising arms, like Aircross in South Korea, owned by the parents of SK Telecoms the biggest mobile operator, or like D2 Communications in Japan, the joint venture of Japan's largest mobile operator NTT DoCoMo and Dentsu, Japan's largest ad agency.