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Japan 📱 Mobile Network

Area Code 70 – Mobile Network

The phone area code for Mobile Network is 70 (international format +8170). Browse local exchange codes (NXX) and carrier assignments below.

Current Local Time
12:34:44
Asia/Tokyo • UTC +09:00
Full Dialing Format
+8170
Population N/A
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Admin Region Japan
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Elevation N/A
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GPS Coordinates N/A
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Overview of Japan's Mobile Prefix 070

In Japan, the prefix 070 is a non-geographic mobile number prefix assigned to Mobile Network Operators (MNOs) and Mobile Virtual Network Operators (MVNOs). Unlike geographic area codes (e.g., 03 for Tokyo), 070 numbers are not tied to any physical location, allowing subscribers to retain their numbers when moving across the country. The Japanese numbering plan, governed by the Ministry of Internal Affairs and Communications (MIC) and aligned with ITU-T E.164, designates 070 for mobile services, alongside 080 and 090. The 070 range was introduced to supplement the growing demand for mobile numbers, particularly for services like PHS (Personal Handy-phone System) and later for LTE/5G data-centric plans.

Dialing Format and Number Structure

Japanese mobile numbers using the 070 prefix follow a standard 11-digit national significant number (NSN) format: 070-XXXX-XXXX. When dialed internationally, the country code +81 replaces the leading zero, resulting in +81 70 XXXX XXXX. For example, a typical number would be +81 70 1234 5678. It is crucial to omit the leading zero when dialing from abroad. Within Japan, callers must dial the full 11-digit number, including the prefix, even for local calls, as mobile numbers are not area-code dependent.

Number Portability and Routing

Japan implemented Mobile Number Portability (MNP) in 2006, allowing users to switch carriers while retaining their 070 number. As a result, the prefix does not indicate a specific operator; it merely signifies that the number is mobile. Routing is handled via a centralized database, ensuring calls and SMS are delivered correctly regardless of the underlying network. For international SMS and voice calls, the +81 country code and the 070 prefix are used, and the call is routed to the appropriate mobile network based on the ported number's current carrier.

Usage and Considerations

070 numbers are widely used for personal mobile communications, as well as for IoT devices and data-centric services. When contacting a Japanese mobile user from abroad, ensure you have the correct full number, including the 070 prefix. Be aware that some online services may not accept 070 numbers for verification due to their association with prepaid or data-only plans, but this is not a universal restriction. For businesses, using 070 numbers for customer contact is common, but for official hotlines, toll-free numbers (0120) or geographic numbers are often preferred.

❓ Frequently Asked Questions

What is the international dialing format for a Japanese 070 mobile number?
To call a Japanese mobile number starting with 070 from abroad, dial your country's exit code, then Japan's country code +81, followed by the number without the leading zero. For example, +81 70 1234 5678.
Are 070 numbers in Japan tied to a specific region?
No, 070 is a non-geographic mobile prefix. It is not associated with any specific city or region, and users can keep their number when moving anywhere in Japan.
Can I port my 070 number to another carrier in Japan?
Yes, Japan supports Mobile Number Portability (MNP). You can switch carriers while retaining your 070 number, subject to the new carrier's policies.
Do 070 numbers work for SMS and data services?
Yes, 070 numbers support voice, SMS, and data services. They are used by MNOs and MVNOs for mobile plans, including LTE/5G services.
Why might a service not accept my 070 number for verification?
Some online platforms may restrict certain number ranges due to higher fraud risk or because they are associated with prepaid or data-only plans. This is not a standard rule, and many services accept 070 numbers without issue.