What is the country code for Japan?

The country code for Japan is +81.

How are mobile numbers structured in Japan?

Mobile numbers in Japan follow the format `0[7-9]0[Subscriber Number]`, where the prefixes 070, 080, and 090 are used. The subscriber number is 8 digits long, making the full mobile number 11 digits in total.

What are the dialing procedures for international calls to Japan?

To make an international call to Japan, dial the international prefix (e.g., 010 from Japan), followed by Japan's country code (+81), the area code without the leading 0, and the subscriber number. For example, to call a number in Tokyo, you would dial `+81-3-1234-5678`.

Is number portability available in Japan?

Yes, Japan has implemented number portability for both fixed-line and mobile numbers. This allows users to retain their phone numbers when switching between operators, with fixed-line portability introduced in 2007 and mobile portability in 2008.

Which major telecom operators manage mobile numbers in Japan?

The major telecom operators managing mobile numbers in Japan are NTT Docomo, KDDI (au), and SoftBank. They primarily handle mobile numbers with the prefixes 090, 080, and 070.

What is the country code for Japan?

The country code for Japan is +81.

How do I dial an international call from Japan?

To dial an international call from Japan, you need to dial 010, followed by the country code, area code, and subscriber number.

What is the format for a Japanese landline number?

The format for a Japanese landline number is 0[Area Code][Subscriber Number], for example, 03-1234-5678 for Tokyo.

What prefixes are used for mobile numbers in Japan?

Mobile numbers in Japan are distinguished by the prefixes 070, 080, and 090.

How can I identify a toll-free number in Japan?

In Japan, toll-free numbers are identified by the prefix 0120.

What is the emergency number for police in Japan?

The emergency number for police in Japan is 110.

Can I keep my phone number if I switch mobile operators in Japan?

Yes, Japan supports number portability, allowing users to retain their numbers when switching operators.

Who regulates telephone numbering in Japan?

Telephone numbering in Japan is regulated by the Ministry of Internal Affairs and Communications (MIC).

What is the international dialing prefix for Japan?

The international dialing prefix for Japan is 010.

What is the national dialing prefix for Japan?

The national dialing prefix for Japan is 0.

How many digits are typically in a Japanese phone number, excluding the country code?

Typically, a Japanese phone number has 10 digits, excluding the country code.

What is the format for a Japanese mobile number?

The format for a Japanese mobile number is 0[7-9]0[Subscriber Number], for example, 090-1234-5678.

What is the emergency number for fire and ambulance services in Japan?

The emergency number for fire and ambulance services in Japan is 119.

How do I dial a landline number from a mobile phone in Japan?

To dial a landline number from a mobile phone in Japan, you need to dial the full landline number, including the area code.

What is the format for premium rate numbers in Japan?

The format for premium rate numbers in Japan is 0990[Subscriber Number], for example, 0990-123456.

What is the directory assistance number in Japan?

The directory assistance number in Japan is 104.

Which telecom operators handle mobile numbers in Japan?

NTT Docomo, KDDI (au), and SoftBank handle mobile numbers in Japan.

What is the regex pattern for validating geographic numbers in Japan?

The regex pattern for validating geographic numbers in Japan is ^(0\d{1,4})-(\d{1,4})-(\d{4})$.

What should developers consider when handling Japanese phone numbers?

Developers should consider validation using regex patterns, normalization by stripping non-numeric characters, and implementing portability checks through APIs.

Understanding Phone Numbers in Japan

Quick Reference Guide

Country: Japan
Country Code: +81
International Prefix: 010
National Prefix: 0

Overview of Japan's Telephone Numbering Plan

Japan's telephone numbering system, regulated by the Ministry of Internal Affairs and Communications (MIC), follows ITU-T E.164 standards. This guide provides essential insights into number formats, dialing procedures, and regulatory frameworks, ideal for telecom professionals, developers, and system administrators.

Number Formats in Japan

General Number Structure

Format: +81 [Area Code] [Subscriber Number]
Length: Typically 10 digits (excluding the country code)

Geographic Numbers (Landlines)

Geographic numbers are region-specific, with area codes ranging from 1 to 5 digits.

Format: 0[Area Code][Subscriber Number]
Example: 03-1234-5678 (Tokyo), 0742-123-456 (Nara)

Mobile Numbers

Mobile numbers are distinguished by prefixes 070, 080, and 090.

Format: 0[7-9]0[Subscriber Number]
Example: 090-1234-5678

Toll-Free Numbers

Toll-free numbers have specific prefixes, allowing free calls for the caller.

Format: 0120[Subscriber Number]
Example: 0120-123-456

Premium Rate Numbers

Used for services with higher charges, identified by the prefix 0990.

Format: 0990[Subscriber Number]
Example: 0990-123456

Special Service Numbers

Emergency Services: 110 (Police), 119 (Fire and Ambulance)
Directory Assistance: 104
Disaster Relief: 171

Dialing Procedures

Domestic Calls

Landline to Landline: Dial the full number, including the area code.
Landline to Mobile: Use the full mobile number with the prefix.
Mobile to Mobile: Simply dial the full mobile number.

International Calls

Outgoing: Dial 010, followed by the country code, area code, and subscriber number.
Incoming: Dial +81, followed by the area code (without the leading 0) and subscriber number.

Number Portability

Japan supports number portability for both fixed-line and mobile numbers, allowing users to retain their numbers when switching operators.

Major Telecom Operators

NTT Docomo: Handles mobile numbers with prefixes 090, 080, and 070.
KDDI (au): Manages similar mobile prefixes.
SoftBank: Covers a significant share of mobile numbers.
NTT East/West: Manages most geographic numbers.

Technical Considerations for Developers

Validation: Use regex patterns to ensure correct phone number formats.
Normalization: Strip non-numeric characters and format numbers according to international standards.
Portability Checks: Implement APIs for number portability verification.

Regex Patterns for Number Validation

Geographic Numbers:
```
^(0\d{1,4})-(\d{1,4})-(\d{4})$
```
Mobile Numbers:
```
^(0[7-9]0)-(\d{4})-(\d{4})$
```
Toll-Free Numbers:
```
^(0120|0800)-(\d{3})-(\d{3,4})$
```
Premium Rate Numbers:
```
^(0990)-(\d{6})$
```

For the latest updates on telecommunications regulations in Japan, visit the Ministry of Internal Affairs and Communications (MIC) website.