Bottom line: as a rough guide, a major carrier's roaming plan (flat daily rate) tends to suit travelers who use small amounts here and there, while Bloomy eSIM suits those who want to pay only for the capacity and number of days they actually need. SoftBank's "Sekai Anshin Teigaku" roaming adds a per-day charge for each day you use data abroad, with the United States handled separately under a plan called "America Hodai." Bloomy, by contrast, is pay-as-you-go for exactly what you choose, which often feels lighter for short trips, light usage, or a single destination. Prices and terms change, so always check each provider's official, current details (as of 2026) before you buy.
- Major-carrier flat roaming fits short, light use; Bloomy eSIM fits paying only for what you need
- SoftBank keeps your existing number and line, but adds a daily fee for each day you use data
- Bloomy lets you choose capacity and days up front, so the total is visible before you buy
- The United States is handled as a separate "America Hodai" plan on SoftBank
- Phone-number calling and SMS aren't supported, but app-based calls (e.g. WhatsApp) work over data
"Should I just keep using my SoftBank line abroad, or set up a separate eSIM — which is simpler and less likely to cost me?" Many people get stuck here before a trip. In this article, we lay out the pricing mechanics of SoftBank's international roaming (Sekai Anshin Teigaku and America Hodai) side by side with Bloomy eSIM's pay-as-you-go approach, and explain in plain terms who each option suits.
How SoftBank International Roaming Works
SoftBank offers a roaming service called "Sekai Anshin Teigaku" for using mobile data abroad. The key point is that, on top of your usual monthly plan, a charge is added for each day you use data overseas. It helps to think of it as: you generally pay nothing on days you don't use data, and a per-day charge is added on days you do.
Sekai Anshin Teigaku (a flat rate per 24 hours)
This plan lets you use up to a set amount of data at a flat rate per 24-hour period. The data allowance and price depend on the conditions, but it is generally presented in a range of roughly "under about ¥1,000 (around ¥980) per 24 hours for up to about 3GB." Because there are several conditions — what happens after you use up the allowance, larger-capacity tiers, and so on — be sure to check SoftBank's latest official figures for price, capacity, and covered countries as of 2026 (prices can change).
America Hodai Is Handled Separately
For the United States (and some areas such as Hawaii), coverage is offered under a separate framework called "America Hodai." Because it is treated differently from Sekai Anshin Teigaku, it's worth noting that your assumptions change depending on whether you're going to the U.S. or somewhere else. Covered regions and conditions can be updated, so it's best to confirm these on the official site too.
Watch How "Plan Fee + Daily Charge" Adds Up
The appeal of flat-rate roaming is the convenience of using your existing number and line abroad as-is. On the other hand, because the structure stacks a daily charge for each day used abroad on top of your monthly plan fee, the total tends to grow the longer you stay. "Just three days" versus "a full two weeks" can make a big difference in the cost you feel — that's the nature of this approach, where the number of travel days changes the perceived cost significantly.
How Bloomy eSIM Works (Pay-As-You-Go)
Bloomy eSIM is a data eSIM for travel, study abroad, long stays, and similar trips. You install it on your phone via a QR code and activate the line at your destination. The biggest difference is that you choose your destination, the capacity you need, and the number of days — then pay for just that amount up front, pay-as-you-go.
- Buy by selecting the capacity (e.g. lighter or generous) and number of days you need
- Choose a plan that matches the country or region you're visiting, so there's less waste
- Rather than a daily charge that keeps stacking, the total is easy to see at the time of purchase
For cases like "just a little on a short trip," "one specific country," or "fixing my budget in advance," being able to choose only what you need often feels lighter. Because specific capacities, durations, and prices vary by country and season, check the latest details on our eSIM comparison page based on your destination, capacity, and number of days.
Comparing the Pricing "Mechanics" Side by Side
Since the actual figures fluctuate, here we organize the difference in approach (the mechanics). For real prices, check each provider's official site and our comparison page for the latest.
| Item | SoftBank International Roaming | Bloomy eSIM |
|---|---|---|
| Pricing approach | Plan fee + a daily charge per day used (24-hour flat rates stacking up) | Pay-as-you-go for the capacity and days you choose (total visible up front) |
| United States | A separate "America Hodai" plan | Choose a plan that matches your destination |
| Long stays | Daily charges tend to accumulate | Easy to adjust by choosing days and capacity |
| Setup | Convenient — use your current number and line as-is | Requires installing and activating an eSIM |
| Phone number / SMS | Uses your contracted line's number as-is | Data-only by design (see separate note) |
*This is a general overview of the mechanics as of 2026 for pricing, capacity, covered countries, and conditions. For the latest figures, check each provider's official site.
Differences in Signal Quality and Connectivity
"If it's cheap, won't the signal be poor?" is a common worry. Understanding the mechanics here can put your mind at ease.
Major carriers' international roaming typically works by borrowing a local partner network. It's convenient, but depending on the partner and conditions, the available networks or speeds may be limited. Bloomy eSIM instead lets you choose a plan that connects directly to a local network at your destination, so where coverage is good, quality can be comparable — and for some uses may even feel more comfortable.
That said, with either approach, real-world connectivity and speed depend on the local area, time of day, and network congestion. No one can promise "this will always be fast." In rural or mountainous areas, coverage can vary — a caution that applies to both options.
Who Each Option Suits
When flat-rate roaming tends to fit
- You don't want extra steps and prefer to use your current number and line as-is
- Your stay is very short and you'll use data on only a few days
- You're mainly in the U.S. and the "America Hodai" terms work for you
- You want voice calls and SMS on the same device as-is
When Bloomy eSIM (pay-as-you-go) tends to fit
- Your stay is a few days to a few weeks and you want to avoid daily charges stacking up
- You want to fix the total cost in advance by choosing capacity and days
- You only need it in one specific country or region
- Data is your main use (staying in touch via app calls like WhatsApp, where supported)
Whether it pays off depends on your destination and length of stay. If you want to see "what about my case," enter the country, capacity, and days on Bloomy's comparison page and compare it roughly against roaming's daily rate × number of days — it makes the decision easier.
Things to Check Before You Sign Up and Use It
Bloomy eSIM is data-only by design — it does not include a phone number, SMS, or voice calls. If you have situations that require a phone number, SMS, or voice calling (such as identity verification by phone number), it's reassuring to also look into roaming on your contracted line or other options. App-based calls such as WhatsApp may be available wherever you have a working data connection.
Also, an eSIM assumes a compatible device (eSIM support, SIM-lock status, and so on). Checking your device's compatibility and the setup steps before you leave helps you avoid scrambling once you arrive.
Summary: Choose by How You'll Use It, and Cut the Waste
SoftBank's international roaming is appealing for its convenience — keep your number and line as-is, with a daily charge added for each day you use data. Bloomy eSIM is pay-as-you-go for just the capacity and days you need, which tends to feel lighter for short trips, light usage, or a single country, and lets you choose plans that connect directly to a local network. Which one comes out ahead depends on your length of stay, data volume, and destination.
If you'd like to see concrete plans for your destination, browse our Bloomy eSIM comparison page by country, data capacity, and number of days. Start with your own destination and trip length to find a combination that works comfortably for you. Because prices and terms change, always check the latest official figures from SoftBank and other providers as of 2026.
