Japan Phone Number Format & Country Code +81
Japanese mobile numbers are 11 digits locally starting with 0. The trunk prefix 0 is dropped for international dialing, leaving 10 digits after the country code. Mobile prefixes 070, 080, and 090 are used across all carriers. To dial a Japan number internationally, replace the local trunk prefix with +81. For example, 090-1234-5678 becomes +81 90-1234-5678. NumSwift converts between these formats automatically, validating each number against Japan's numbering plan.
Last updated: 2026-03-18
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How to Format Japan Phone Numbers Correctly
- Identify whether the number is in local format (e.g., 090-1234-5678) or already includes the +81 country code
- Paste the number into NumSwift and select Japan as the country
- NumSwift converts it to the standard international format: +81 90-1234-5678
- Use the formatted number for international calls, WhatsApp, SMS, or CRM import
Why Understanding Japan's Number Format Matters
- Avoid failed calls by using the correct +81 prefix instead of local-only formats
- Japan's 10-digit structure means numbers that are too short or too long are invalid — NumSwift catches these errors
- Convert freely between local (090-1234-5678) and international (+81 90-1234-5678) notation
- Works with all Japan carriers including NTT Docomo, au (KDDI), SoftBank, Rakuten
Frequently Asked Questions
▶What is the country code for Japan?
Japan's country code is +81. When dialing a Japan number from abroad, you replace the local trunk prefix with +81. For example, the local number 090-1234-5678 becomes +81 90-1234-5678 in international format.
▶How many digits are in a Japan phone number?
Japan phone numbers are 10 digits after the country code. Japanese mobile numbers are 11 digits locally starting with 0. The trunk prefix 0 is dropped for international dialing, leaving 10 digits after the country code. Mobile prefixes 070, 080, and 090 are used across all carriers. NumSwift validates the digit count automatically, so incorrectly truncated or padded numbers are flagged as invalid.
▶What is the difference between mobile and landline formats in Japan?
In Japan, mobile numbers start with 070, 080, or 090 locally. Landline numbers use different prefixes and may have a different digit distribution between the area code and subscriber number. NumSwift distinguishes between the two types and formats each one correctly.
▶How do I dial a Japan number from another country?
Replace the local trunk prefix with +81 and dial the remaining digits. For example, 090-1234-5678 becomes +81 90-1234-5678. NumSwift performs this conversion automatically when you paste a Japan number and select the correct country. The formatted output is ready for calling, WhatsApp, or saving to your contacts.