Nippon Telegraph and Telephone (日本電信電話 Nippon Denshin Denwa) is a telephone company that dominates the telecommunication market in Japan. It was once a public company.

As a group corporation, it consists of the following major companies:

• NTT East
• NTT West
• NTT Data
• NTT DoCoMo (developed iMode)
• NTT Communications

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