To write phone numbers in Japanese correctly, use hyphens to group the digits in the standard local format, this is about digit grouping, not Japanese script. The clearest documented rule for Japanese phone numbers is to write them with hyphens, producing forms like 090-xxxx-xxxx for mobile numbers and 03-xxxx-xxxx for landlines.
How to write phone numbers in Japanese correctly
Japanese phone numbers follow a hyphenated structure that separates area codes, prefixes, and subscriber numbers. This format applies to all domestic numbers and is consistent across mobile, landline, and toll-free lines. The hyphens improve readability and match the formatting rules documented by Android’s Japanese phone-number utilities.
The standard local format: hyphens are key
Every local Japanese phone number uses hyphens to split the digits into logical groups. The pattern depends on the type of number:
- Mobile numbers: 090-xxxx-xxxx, 080-xxxx-xxxx, 070-xxxx-xxxx
- Landline numbers: area code (e.g., 03) followed by the subscriber number, written as 03-xxxx-xxxx
When writing phone numbers, it is common to use hyphens to separate the digits for better readability. The area code is usually enclosed in parentheses, while the seven-digit number is separated into groups of three and four digits with a hyphen.
Mobile phone numbers (090, 080, 070)
Mobile numbers always begin with a three-digit prefix, 090, 080, or 070, followed by an eight-digit subscriber number. Write them as 090-xxxx-xxxx, 080-xxxx-xxxx, or 070-xxxx-xxxx. For example, a typical mobile number looks like 090-1234-5678. Mobile numbers in Japan often start with different prefixes, depending on the mobile service provider. Mobile numbers should also be enclosed in parentheses with hyphens to maintain consistency. Android’s Japanese formatting rules confirm this hyphenated structure.
Landline numbers (e.g., Tokyo’s 03 code)
Landline numbers consist of an area code (one to three digits) and a subscriber number. Tokyo’s area code is 03, so a Tokyo landline is written as 03-xxxx-xxxx. Other cities have different area codes, but the hyphenated pattern remains the same: area code hyphen subscriber number. Android’s documentation shows 03-xxxx-xxxx as the correct local form.
Toll-free numbers (0120, 0800)
These numbers have a shorter subscriber portion than mobile or landline numbers. Android’s Japanese formatting explicitly lists 0120-xxx-xxx as an example.
How to write Japanese numbers in international format (+81)
To write a Japanese phone number for international use, drop the leading zero and add the country code +81. Then insert hyphens in the same positions as the local format. Examples:
- Landline: +81-3-xxxx-xxxx (from local 03-xxxx-xxxx)
- Mobile: +81-90-xxxx-xxxx (from local 090-xxxx-xxxx)
- Toll-free: +81-120-xxx-xxx (from local 0120-xxx-xxx)
This format works for both calling and writing, and it follows the same hyphenated grouping used domestically. If you need to understand international calling codes and dialing, the +81 prefix is the key for reaching Japan from abroad. For a full reference on phone number formats and digits, the local hyphenated structure and the +81 conversion are the two essential patterns.
Phone number formatting on iPhone and Android
Android has a documented Japanese phone-number formatting rule. The Android developer reference includes a FORMAT_JAPAN constant in PhoneNumberUtils and a formatJapaneseNumber() function that applies Japanese hyphenation. The documented examples are 03-xxxx-xxxx, 090-xxxx-xxxx, 0120-xxx-xxx, +81-3-xxxx-xxxx, and +81-90-xxxx-xxxx. No user-facing Settings path or app-specific limits are documented for this behavior.
The retrieved Apple support content does not list a Japanese-specific menu path, supported models, or iOS versions for this feature.
Frequently Asked Questions
Does Japan use spaces or parentheses in phone numbers?
No. The documented Japanese format uses hyphens only. Android’s Japanese formatting examples show hyphens, not spaces or parentheses.
What happens for international format?
Drop the leading zero and add +81. For example, 090-xxxx-xxxx becomes +81-90-xxxx-xxxx, and 03-xxxx-xxxx becomes +81-3-xxxx-xxxx.
Is there a documented iPhone switch for Japanese formatting?
Not in the Apple help content retrieved here. iPhone’s automatic formatting toggle does not include a Japan-specific setting.
How do I write a mobile number with country code?
To write mobile number with country code, use +81-90-xxxx-xxxx (or +81-80-xxxx-xxxx, +81-70-xxxx-xxxx). Remove the leading zero from the prefix.
What are the emergency numbers in Japan?
Police: 110. Fire department and ambulance: 119. These are dialed without an area code and do not use hyphens. In case of emergency, it's essential to know how to dial emergency numbers in Japan. The emergency number for police is 110, while the fire department and ambulance can be reached at 119. These emergency numbers are dialed without an area code and do not require any additional formatting.
Do I include the area code when calling within the same city?
Yes. Even if you are in the same area, you must dial the area code for domestic calls within Japan. If you are calling a domestic number within Japan, you need to include the area code even if you are in the same area.
