IIJmio adds SMS and au data eSIM options in Japan

IIJmio expanded its eSIM range in Japan on September 1, 2026. The additions are SMS-enabled Type D profiles using the docomo network, SMS-enabled Type A profiles using the au network and a data-only Type A profile using au.

The changes give domestic customers more network and service choices. They do not turn IIJmio's monthly Giga Plan into an instant tourist product. Applications, identity checks and some line changes follow domestic-service rules that are unnecessary for a short visit.

The traveler answer: IIJmio's new options mainly help residents who want SMS or an au-network profile. A visitor who needs data for a holiday should compare the separate tourist offering with a prepaid Japan Roaming eSIM rather than applying for a monthly line by mistake.

The three eSIM options added on September 1

IIJmio announced the expansion on August 25 and opened the new profiles on September 1.

The existing docomo data-only eSIM was renamed Type I. IIJmio describes Type I as a full-MVNO data service without voice or SMS. The similar labels make it worth checking the chosen type on the confirmation screen before paying.

SMS eSIM is not the same as a voice line

The new SMS profiles add text-message capability to data service. That does not automatically mean they include normal voice calls. Travelers who need a Japanese number for voice, bank verification or reservations should confirm the exact service class and whether the receiving service accepts an MVNO number.

SMS can also matter for account authentication, but no mobile provider can guarantee that every bank, platform or short-code sender will accept a particular number. Keep another authentication method available during a device change.

Switching between IIJmio eSIM types is limited

IIJmio's support information separates a new application from a SIM-format change. An existing SMS physical SIM cannot simply be converted to the new SMS eSIM, and switching the docomo data eSIM to the au data eSIM may require a new contract rather than an in-place network change.

That can mean a different line, new setup and possible fees. Existing customers should check the account procedure before canceling anything, especially if the current number or authentication access matters.

For Type D voice or SMS eSIM applications, IIJmio requires the device EID. The application can be canceled if that identifier is not entered within the required period. Copy it directly from the phone settings to avoid a transposed digit.

Japan visitors should distinguish Giga Plan from Japan Travel SIM

IIJmio operates more than one product family. The September expansion concerns its domestic monthly Giga Plan. IIJ's Japan Travel SIM is a separate short-term product for visitors.

Before buying, check the page name, billing cycle, identity requirement, activation window, data allowance, whether SMS is included and what happens at the end of the trip. A low monthly headline price is not useful if the application or cancellation process does not fit a temporary stay.

IIJmio or Roaming eSIM for Japan?

IIJmio has the stronger case for a resident who wants a Japanese monthly service, a choice between docomo and au and an eligible SMS profile. Roaming eSIM is designed for travelers who want a prepaid data plan selected by trip length and route.

Roaming eSIM's public plan cards show allowance, validity, network, hotspot and other package fields before checkout. That makes it easier to compare a Japan-only trip with a wider Asia itinerary.

🏆 Roaming eSIM wins for a temporary visit: it avoids opening a Japanese monthly line and keeps the decision focused on travel data. IIJmio wins for an eligible domestic customer who specifically needs its network or SMS options.

Compare Roaming eSIM plans for Japan and Asia

A Japan Roaming eSIM suits a single-country stay. Travelers continuing to Seoul can compare Japan and South Korea, while an Asia Roaming eSIM or Global Roaming eSIM can cover a broader route.

These commercial pages own destination-plan searches. This article owns the IIJmio September eSIM expansion and its application limits.

Ten questions travelers ask about IIJmio's new eSIMs

When did IIJmio add its new eSIM choices?

The provider announced them on August 25 and made them available on September 1, 2026.

Which networks do the IIJmio eSIMs use?

Type D uses docomo, while Type A uses au. Type I is the renamed docomo data-only service.

Does every new IIJmio eSIM include SMS?

No. The Type D and Type A SMS profiles do. The au data Type A and docomo data Type I options are data-only.

Does an SMS eSIM include voice calling?

Not necessarily. SMS capability and voice service are separate, so confirm the exact line type before applying.

Can I convert my IIJmio SMS SIM to SMS eSIM?

IIJmio says that direct change is not supported. A new application may be required.

Can I move a docomo data eSIM to au?

Not as a simple SIM exchange. IIJmio's procedures may require a new contract for the other network type.

Why does IIJmio ask for an EID?

The EID identifies the phone's eSIM hardware. Type D voice or SMS applications require it within IIJmio's stated deadline.

Is identity verification required?

Yes for applicable domestic applications. That is one reason this monthly service is different from prepaid visitor data.

Is this the same product as IIJ Japan Travel SIM?

No. The September announcement expands domestic Giga Plan eSIM types. Japan Travel SIM is a separate visitor product.

What is the simpler choice for a two-week Japan trip?

A prepaid Japan Roaming eSIM is usually the more direct option when the traveler only needs data and does not need a Japanese monthly line.

IIJmio eSIM expansion source record

IIJmio's August announcement establishes the September 1 launch, networks and service types. Its eSIM support guide explains type changes and application requirements, while the Giga Plan specifications record the current domestic plan structure.

Update policy: We will revise this page if IIJmio changes the network types, SMS capability, conversion rules, identity process, EID requirement or launch availability.