JAPAN PHONE NUMBER FORMAT

How to Write a Japanese Phone Number With +81

Convert Japanese mobile and landline numbers to +81 international format by removing the leading domestic zero, with practical examples.

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SHORT ANSWER

What to do

Replace the number’s first 0 with Japan’s country code +81. Do not keep both: 090-1234-5678 becomes +81 90-1234-5678.

WORKED EXAMPLE

See the rule in practice

JAPAN DOMESTIC090-1234-5678

INTERNATIONAL+81 90-1234-5678

The +81 conversion rule

Start with the complete Japanese domestic number.
Remove only the first zero.
Add +81 before the remaining digits.
Keep or remove spaces and hyphens according to the destination form.

Mobile and landline examples

TYPEDOMESTICINTERNATIONAL

Mobile090-1234-5678+81 90-1234-5678

Tokyo03-1234-5678+81 3-1234-5678

Osaka06-1234-5678+81 6-1234-5678

Domestic versus international form fields

A Japanese form may require the domestic version even if you can type +81. Follow its example. If the field accepts digits only, remove punctuation but do not add or drop any other digits.

Common +81 mistakes

Writing +81 090 and keeping the trunk zero
Removing every zero instead of only the first one
Dropping a digit while retyping without hyphens
Using +81 in a domestic-only field

Frequently asked questions

Is +81 090 correct?

No. Remove the domestic trunk zero: 090-1234-5678 becomes +81 90-1234-5678.

How do I write a Tokyo 03 number internationally?

Replace the leading 0 with +81, so 03-1234-5678 becomes +81 3-1234-5678.

Can I remove spaces and hyphens?

Yes, when a form accepts compact international numbers. +819012345678 contains the same digits as +81 90-1234-5678.