The number of digits in a Japanese phone number depends on whether you're referring to a mobile number or a geographic (landline) number.
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Mobile Numbers: Japanese mobile phone numbers typically consist of 11 digits.
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Geographic (Landline) Numbers: These numbers are generally 10 digits long, including the area code but not including the leading zero of the area code. Area codes vary in length depending on population density: more populated areas have shorter area codes, while less populated areas have longer area codes. For example, Osaka's landline numbers often appear as "06 xxxx xxxx," but omitting the leading zero of the area code, the total number of digits is 9. However, including that omitted leading zero and when dialing from outside of Japan, there are 10 digits.
Therefore, the answer depends on the context: a mobile number has 11 digits, while a landline number usually has 10 digits when considering the full international format. When referring to the geographic numbers as presented domestically, they have 9 digits when excluding the leading zero of the area code.
