Mobal vs Airalo vs Sakura Mobile: Japan SIM Guide (2026)

Start with the plan you need: data only, or data plus a Japanese voice/SMS number. Then compare its total cost, high-speed allowance and activation requirements. Mobal, Airalo and Sakura Mobile each sell more than one product; the brand name alone cannot decide which fits your trip.

For a data-only visit, compare Airalo’s fixed-data and Unlimited packages with Sakura’s travel data plans and Mobal’s data-only options. If you have a confirmed need for a Japanese number, compare Mobal’s voice products with Sakura’s separate monthly voice plans. You do not need to buy a local number simply to use maps or browse restaurant websites.

Official pages checked September 25, 2026. This is a desk-researched comparison, not a firsthand speed, coverage or customer-support test. Mobal and Sakura comparison links marked below are affiliate links; purchases may earn us a commission.

The differences that affect your purchase

Provider and product	Japanese voice/SMS number?	Main comparison point	Check before purchase
Mobal Voice-Only / Voice+Data SIM or eSIM	Yes; data-only products are separate	Local calls and verification, with different data allowances	Initial purchase plus service charges; ID check; voice eSIM access-code collection or delivery
Mobal Data-only eSIM	No; no voice or SMS	Travel data with email delivery and no ID check	Compatible unlocked phone, package validity, high-speed and hotspot allowances
Airalo Japan data eSIM	No Japanese number in the data packages compared here	Both fixed-GB and Unlimited packages are available	Validity, high-speed allowance, activation policy and compatible unlocked phone
Sakura Mobile travel data eSIM	No	Docomo and au packages have different data and hotspot conditions	Select your dates and read the particular package’s limits
Sakura Mobile monthly Voice SIM / eSIM	Yes	A separate recurring voice service, not the travel data product	ID, collection method, activation fee, monthly billing and cancellation terms

Product details: Mobal SIM, Mobal eSIM, Airalo Japan, Sakura travel eSIM and Sakura monthly voice.

First check whether you need a local number

A phone-number field is not proof that a Japanese SIM is required. GO supports overseas mobile-number registration. Apple’s requirements for adding Suica or PASMO directly in Wallet do not list a Japanese phone number. Tabelog’s English booking instructions use email verification and confirmation, while still asking for phone contact details.

Check the exact service you intend to use, including its verification method and whether your home number can receive messages in Japan. Some ticketing procedures have stricter requirements. Buying a number does not guarantee eligibility for an app, event or account. Our Japanese phone-number guide explains the differences and current Mobal price examples.

If your current number and booking arrangements already work, assess a data-only plan first. If a necessary service explicitly requires local voice or SMS, include that requirement before comparing prices.

“Unlimited” does not describe every limit

Airalo: the official storefront includes fixed-data packages as well as Unlimited. Its Unlimited Fair Use Policy sets a default threshold of 3GB per day, then 1 Mbps until the next 24-hour reset measured from activation. A package can specify a different threshold, so read its details before paying. Unlimited total data is not a promise of uninterrupted full speed.

Sakura travel eSIM: the current Docomo package lists 3GB of high-speed data per day, then 200 Kbps. The au package advertises unlimited high-speed data but a separate hotspot allowance that varies with package length. For example, its seven-day listing shows up to 6GB for hotspot use. Neither description justifies recommending every Sakura package for heavy laptop tethering. See the current plan conditions.

Mobal: Voice-Only includes no data; Voice+Data products have specified high-speed allowances. The voice eSIM page describes reduced-speed data after the allowance on the relevant plans. Check the allowance and reset rules for the exact package rather than treating every Mobal product as interchangeable. Mobal voice eSIM details.

For video calls, file uploads or several devices sharing a connection, compare hotspot limits and the speed after throttling separately from the headline data allowance. For rural travel, check the listed network’s coverage for your actual destination. This comparison does not establish a measured winner for mountains, trains or particular buildings.

Receiving a voice eSIM can take more planning

Mobal’s Data-only eSIM has no Japanese phone number, voice or SMS. It needs no ID check and arrives by email with activation instructions. Follow the selected package’s start rules: for example, the listed 16-day Unlimited plan starts on its first network connection in Japan and counts that calendar date as day one. Email delivery alone does not tell you when paid validity begins.

Mobal’s voice eSIM requires a physical access code, picked up or shipped, with identity verification. It is not the same email-only purchase flow as a typical travel data eSIM. Check the delivery or pickup arrangements before relying on it for arrival-day verification.

Sakura’s monthly voice page also describes ID checks. It offers a passport-and-pickup route for people without documents showing a registered Japanese address, alongside online verification routes using eligible Japanese documents. Do not assume its voice plans are available only to residents, or that they have the same delivery process as travel eSIMs. Confirm your documents and selected collection method with the provider.

For any plan, check device compatibility before purchase and keep the setup instructions accessible. Support availability, contact method and airport counter hours may affect your choice; this guide does not rank response times we have not tested.

Compare the cost of your actual trip

Put the same travel dates into each provider’s current offer and record:

1. What you pay upfront: the complete prepaid package, or an initial SIM/eSIM purchase followed by separate service charges.
2. What can be billed later: recurring months, calls, outgoing SMS, add-ons and renewals. Confirm cancellation steps where relevant.
3. What you can use: high-speed data, the period before it resets, hotspot allowance and voice/SMS features.
4. What happens before service starts: ID verification, pickup or delivery, installation and activation.

Compare totals in the same currency with tax and any card conversion costs accounted for. A cheap monthly starting price can be the wrong comparison for a short prepaid trip, while a data-only package cannot replace a voice requirement it does not support.

Once you have those answers, compare the current offers:

• Mobal Data-only eSIM plans — affiliate link; compare these if you need travel data without a Japanese number.
• Mobal Voice+Data physical SIM plans or Mobal voice eSIM plans — affiliate links; check ID, pickup or delivery, and activation requirements if you need a Japanese number.
• Airalo Japan packages — inspect both fixed-data and Unlimited options.
• Sakura Mobile plans — affiliate link; distinguish travel data from monthly voice service.

For a wider shortlist, see our Japan eSIM guide. For another data-only comparison, see Airalo vs Ubigi.