One of the Korea government officer said, "Last year, sales of adult contents by SK Telecom, KTF and LG Telecom reached 33.3 billion won, 20.6 billion won, and 5.6 billion won, respectively, which was 59.5 billion won in total." 59.5 billion won is about 58 million USD.

While sooner every children could have their own mobile phone easily, we should have a filtering system to block the adult content to children's handset. Juniper Research said that European customers are currently the biggest spenders on adult content, with an average annual revenue per user of more than $34.

In the United States, where there is no filtering of WAP sites, anyone can browse wireless adult content sites. Most U.S. carriers will enable their billing systems to be used by adult content providers, but only after they discover an acceptable mechanism for blocking underage viewing.

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