TU-KA (TU-KA by KDDI), a subsidiary company of KDDI, was a 2G PDC cellular operator in three metropolitan areas (Tokyo, Nagoya, and Osaka), which did not apply a 3G license.
The services include voice (full and half-rate), supplementary services (call waiting, voice mail, three-way calling, call forwarding, and so on), data service (up to 9.6 kbit/s CSD), and packet-switched wireless data (up to 28.8 kbit/s PDC-P).
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J-PHONE grew steadily for a decade by continuously introducing new services and enhancements such as SkyWalker for PDC, SkyMelody ringtone download, the famous Sha-Mail picture mail introduced on the basis of camera phones developed by SHARP, the mobile multimedia data service J-Sky modeled after NTT DoCoMo's i-mode, and advanced Java services based on JSCL, modeled after NTT DoCoMo's DoJa based i-appli.