---
title: "IIJmio: MCC 440 MNC 03"
mcc: "440"
mnc: "03"
plmn: "44003"
brand: "IIJmio"
operator: "Internet Initiative Japan Inc."
country: "Japan"
country_iso: "JP"
region: "Asia & Middle East"
updated: "2025-04-09"
canonical: "https://mcc-mnc.org/networks/440_03"
---

# IIJmio: MCC 440, MNC 03 (Japan)

**IIJmio** (operator: Internet Initiative Japan Inc.) is a mobile network in [Japan](https://mcc-mnc.org/countries/japan.md) (Asia & Middle East), identified by MCC **440** and MNC **03**: PLMN ID 44003, also written 440-03 or 440 03.

## Identifiers

| Field | Value |
|---|---|
| MCC (Mobile Country Code) | 440 |
| MNC (Mobile Network Code) | 03 |
| PLMN ID (MCC+MNC) | 44003 |
| TADIG code | — |
| Brand | IIJmio |
| Operator | Internet Initiative Japan Inc. |
| Country | Japan (JP) |
| Region | Asia & Middle East |
| Dialling code | — |
| Technologies | — |
| Last updated | 2025-04-09 |

## Technologies & bands

| Generation | Bands | Measured cells |
|---|---|---|
| Other | [MVNO](https://mcc-mnc.org/coverage/mvno.md) | — |

## Voice & calling services

| Service | Status | Source |
|---|---|---|
| VoLTE | Unknown | — |
| VoWiFi | Unknown | — |
| ViLTE | Unknown | — |
| VoNR | Unknown | — |

A service not marked Supported or Not supported is unknown: no data either way, not a sign that the network lacks it.

## About IIJmio

Internet Initiative Japan Inc. (IIJmio) is a prominent Mobile Virtual Network Operator (MVNO) based in Japan, operating within the Asia & Middle East region. Utilizing the Mobile Country Code (MCC) 440, which identifies Japan, and the Mobile Network Code (MNC) 03, IIJmio offers a variety of data and voice plans to consumers, often at competitive prices compared to major carriers like NTT Docomo, KDDI (au), and SoftBank. As an MVNO, IIJmio leverages the infrastructure of one or more of these established networks to provide its services, leading to a wide availability across the country. The flexibility and affordability of IIJmio have made it a popular choice for budget-conscious users and those seeking customizable data options.

IIJmio distinguishes itself through its diverse service offerings, including pre-paid and post-paid plans, along with various SIM card options (data-only, voice, and SMS). Many users appreciate the ability to switch between data allowances and throttle speeds to conserve data usage, something not always readily available with larger competitors. Furthermore, IIJmio's active online community and customer support system fosters user engagement and helps troubleshoot issues. The network’s commitment to providing value-added services and a seamless user experience has contributed significantly to its growth, solidifying its position as a respected MVNO within Japan’s dynamic telecommunications landscape.

## APN settings

| Name | APN | Types | Protocol | Username | Password | Source |
|---|---|---|---|---|---|---|
| IIJmio (TypeI) | `iijmio.jp` | default, ia | IPV4V6 | `mio@iij` | `iij` | AOSP |
| vmobile.jp | `vmobile.jp` | default, ia | IPV4V6 | `vmobile@jp` | `vmobile` | AOSP |

Settings come from Android's AOSP and LineageOS APN lists and user corrections.

## Android carrier config highlights

| Setting | Value | Key |
|---|---|---|
| SIM country iso override | jp | `sim_country_iso_override_string` |

## Other networks in Japan

| MCC | MNC | Network | TADIG |
|---|---|---|---|
| 440 | 00 | [Y Mobile](https://mcc-mnc.org/networks/440_00.md) | — |
| 440 | 01 | [UQ WiMAX](https://mcc-mnc.org/networks/440_01.md) | — |
| 440 | 02 | [Hanshin Cable Engineering Co., Ltd.](https://mcc-mnc.org/networks/440_02.md) | — |
| 440 | 04 | [Japan Radio Company, Ltd.](https://mcc-mnc.org/networks/440_04.md) | — |
| 440 | 05 | [Wireless City Planning Inc.](https://mcc-mnc.org/networks/440_05.md) | — |
| 440 | 06 | [SAKURA Internet Inc.](https://mcc-mnc.org/networks/440_06.md) | — |
| 440 | 07 | [LTE-X, Inc.](https://mcc-mnc.org/networks/440_07.md) | — |
| 440 | 08 | [Panasonic Systems Solutions Japan Co., Ltd.](https://mcc-mnc.org/networks/440_08.md) | — |
| 440 | 09 | [Marubeni Wireless Communications Inc.](https://mcc-mnc.org/networks/440_09.md) | — |
| 440 | 10 | [NTT docomo](https://mcc-mnc.org/networks/440_10.md) | JPNDO |
| 440 | 11 | [Rakuten Mobile Network, Inc.](https://mcc-mnc.org/networks/440_11.md) | — |
| 440 | 12 | [Cable media waiwai Co., Ltd.](https://mcc-mnc.org/networks/440_12.md) | — |
| 440 | 20 | [SoftBank](https://mcc-mnc.org/networks/440_20.md) | JPNJP |
| 440 | 21 | [SoftBank](https://mcc-mnc.org/networks/440_21.md) | — |
| 440 | 50 | [au](https://mcc-mnc.org/networks/440_50.md) | — |
| 440 | 51 | [au](https://mcc-mnc.org/networks/440_51.md) | JPNKI |
| 440 | 52 | [au](https://mcc-mnc.org/networks/440_52.md) | — |
| 440 | 53 | [au](https://mcc-mnc.org/networks/440_53.md) | — |
| 440 | 54 | [au](https://mcc-mnc.org/networks/440_54.md) | — |
| 440 | 70 | [au](https://mcc-mnc.org/networks/440_70.md) | — |
| 440 | 71 | [au](https://mcc-mnc.org/networks/440_71.md) | — |
| 440 | 72 | [au](https://mcc-mnc.org/networks/440_72.md) | — |
| 440 | 73 | [au](https://mcc-mnc.org/networks/440_73.md) | — |
| 440 | 74 | [au](https://mcc-mnc.org/networks/440_74.md) | — |
| 440 | 75 | [au](https://mcc-mnc.org/networks/440_75.md) | — |
| 440 | 76 | [au](https://mcc-mnc.org/networks/440_76.md) | — |
| 440 | 78 | [au](https://mcc-mnc.org/networks/440_78.md) | — |
| 440 | 91 | [Tokyo Organising Committee of the Olympic and Paralympic Games](https://mcc-mnc.org/networks/440_91.md) | — |
| 441 | 01 | [SoftBank](https://mcc-mnc.org/networks/441_01.md) | — |
| 441 | 10 | [UQ WiMAX](https://mcc-mnc.org/networks/441_10.md) | — |

---

HTML version: https://mcc-mnc.org/networks/440_03 · Index for AI agents: https://mcc-mnc.org/llms.txt · Data is community-maintained; corrections welcome on the HTML page.