WiderThan, the Korea-based mobile Internet service provider, has acquired Reston, Va.-based content provider Ztango. WiderThan says the deal will enable it to bring wireless services such as ringback

WiderThan, the Korea-based mobile Internet service provider, has acquired Reston, Va.-based content provider Ztango. WiderThan says the deal will enable it to bring wireless services such as ringback tones and music-on-demand to the United States.

Terms of the stock deal were not disclosed. Ztango will continue to operate under that name, as a division of Widerthan.

WiderThan has significant market penetration in Asia and Europe. The Seoul-based company claims to have 30 mobile-carrier partners and 210 million subscribers.

Ztango, which is best known for its unbranded ringtones, works with most major U.S. carriers, including AT&T Wireless, Cingular, Sprint and Verizon Wireless

The acquisition should facilitate the U.S. rollout of ringback tones, which allow customers to use personalized music clips in place of traditional switchboard calling tones.

WiderThan CEO SJ Park says the company should offer ringback tones in the States by the end of 2004, as well as full-length downloads to mobile phones by mid-2005.