Reviewed country-pair guide

How to call Japan from Singapore

Exact mobile, landline, international-access and leading-zero rules using safe placeholder numbers.

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Reviewed by countrycalling.codes editorial team

Dialing sequence, step by step

  1. 1

    Start with + on a mobile, or 001 when the Singapore network requires an all-digit access prefix.

  2. 2

    Add 81, the country calling code for Japan.

  3. 3

    Add the destination national significant number. Remove the first domestic 0 before adding +81.

Singapore networks offer several international access prefixes. Whichever access service is used, remove the Japanese domestic 0 before country code 81.

Mobile and landline examples

X means a subscriber digit placeholder, so these patterns explain the transformation without publishing a private callable number. Save the + format; use the access-prefix format only for a call that starts in Singapore.

Number typeDomestic in JapanSave on mobileDial from Singapore
Mobile090 XXXX XXXX+81 90 XXXX XXXX001 81 90 XXXX XXXX
Landline03 XXXX XXXX+81 3 XXXX XXXX001 81 3 XXXX XXXX

How the international format is built

Portable contact format

+ 81 + national significant number

The + represents international access. It is display notation, not one of the E.164 digits.

Digits-only call from Singapore

001 + 81 + national significant number

The first part routes out of the origin network and must not be stored as part of the destination.

E.164 limits the full international number to 15 digits and excludes international and national prefixes. See the E.164 and international-format guide for the reusable structure and regional exceptions.

Common mistakes for this route

  • Retaining the Japanese domestic 0 after country code 81.
  • Mixing two Singapore international-access services in the same dial string.

Country code references

Singapore +65

Origin and exit-prefix details

Japan +81

Destination code and number formats

Standards and country numbering-plan sources

  1. ITU-T E.164: The international public telecommunication numbering planInternational Telecommunication Union. Verified 2026-07-19.
  2. ITU-T E.123: Notation for national and international telephone numbersInternational Telecommunication Union. Verified 2026-07-19.
  3. National numbering plan: SingaporeInternational Telecommunication Union. Verified 2026-07-19.
  4. National numbering plan: JapanInternational Telecommunication Union. Verified 2026-07-19.

See our editorial and sourcing methodology.