Today I Learned
Mobal vs Airalo vs Sakura 2026: One Feature Decides the Japan SIM
Mobal vs Airalo vs Sakura Mobile in 2026 — real prices, data caps, and the one feature that splits the field: only one gives you a Japanese phone number.
The decision tree, in one sentence
Most “best Japan SIM” articles bury the actual decision under a wall of plan tables. Here it is plainly: if you need a Japanese phone number, you want Mobal. If you only need data and want the fastest self-serve buy, you want Airalo. If you want truly unlimited high-speed data on the Docomo network and you’ll be in rural Japan, you want Sakura Mobile. The rest of this article is just the evidence.
The three providers, side by side
Mobal — the only one that gives you a phone number
Mobal is a UK-headquartered carrier reselling on the SoftBank network, aimed at long-stay visitors and residents. Their differentiator is simple and surprisingly hard to find elsewhere: a real Japanese 070/080/090 phone number issued at sign-up. They sell both physical SIM (delivered by post or pickup) and eSIM (instant QR delivery).
- Voice+Data SIM: ¥3,960 SIM cost + from ¥1,650/month, plans 1GB / 5GB / 10GB / 30GB. Real Japanese phone number.
- Voice+Data eSIM: instant delivery, same Voice+Data plans. Real phone number.
- Voice Lite SIM: ¥3,300 SIM cost + ¥990/month, 500MB included, ¥2,500 flat once you exceed 3GB. Real phone number, very cheap if you mainly want a number for reservations and ride apps.
- Network: SoftBank, 4G/5G in cities.
Airalo — the data-only unlimited eSIM
Airalo is a global eSIM marketplace. Pure data, no phone number, no SMS, no voice. Install a QR code, land, connect. One big change since we first wrote this comparison: as of our August 25, 2026 check, Airalo’s Japan storefront sells unlimited day-based plans only — the old fixed-GB “Moshi Moshi” plans (5GB / 7 days for ¥1,650 and friends) no longer appear on the Japan page.
- Lineup: 3 / 5 / 7 / 10 / 15 / 30 days, all unlimited. As displayed to us in the US-dollar storefront: US$11.50 (3 days), US$17 (5 days), US$27 (7 days), US$34.50 (10 days), US$48 (15 days), US$69 (30 days). Airalo localizes currency by region — the yen storefront showed ¥1,900 (3 days) to ¥11,350 (30 days) when we checked on August 19, 2026.
- The “unlimited” fine print: under Airalo’s Fair Use Policy, you get full speed for the first 3GB each day, then a 1 Mbps throttle until the daily reset (counted 24 hours from activation).
- Network: SoftBank plus one additional network the storefront doesn’t name.
Sakura Mobile — the unlimited-and-rural pick
Sakura Mobile is Tokyo-based, English-speaking customer support, mostly Docomo network. Their travel line skips the phone number entirely (the “Voice SIM” they advertise is for residents on long-term visas), but they offer the cleanest truly unlimited experience for travelers.
- 7-day 4G Unlimited: from ~¥4,200 (3GB/day soft cap, then throttled).
- 7-day 5G Unlimited (au network): from ~¥5,000.
- 10-day, 21-day, 31-day options scale linearly; longer trips get multi-SIM bundles.
- Network: Docomo (4G plan) or au (5G plan).
- Pickup: airport counters at Narita, Haneda, Kansai; or hotel delivery; or eSIM QR.
”Best for X” — the honest cross-table
| Scenario | Pick | Why |
|---|---|---|
| 3-7 day trip, Tokyo + Kyoto only, just maps and translation | Airalo unlimited 3–7 days | Fastest self-serve buy: US$11.50 (3 days) to US$27 (7 days) as displayed Aug 2026, full speed up to 3GB/day. No phone number needed for sightseeing. |
| 14-30 day trip, mix of cities and a few rural spots | Mobal Voice+Data eSIM or Airalo 30-day unlimited | Mobal if you’ll book restaurants / ride-hail; Airalo (US$69 as displayed Aug 2026) if you stay app-light. |
| Restaurants you reserve via Tabelog, OpenTable, or by phone | Mobal Voice+Data SIM | Tabelog confirms reservations by SMS the day before. No JP number = silent cancellation. |
| Long stay (1-3 months), business meetings, banking | Mobal Voice+Data SIM | Phone number persists; you can keep the SIM for return trips. |
| Rural hiking, Hokkaido north, Kyushu interior | Sakura Mobile 4G Unlimited | Docomo coverage is meaningfully better in mountains. |
| Heavy hotspot use for a remote-working trip | Sakura Mobile 5G Unlimited | Truly unlimited (with 3GB/day daytime cap), no overage. |
| Family of 4 sharing one connection | Sakura Mobile multi-SIM | Discounts on 46/62/93-day bundles include multiple SIMs. |
| You only realized at the airport you needed data | Airalo via app | Instant QR delivery, no kiosk queue. (Mobal eSIM is also instant.) |
The phone-number gap, expanded
This is the part most comparisons skip, because a data-only eSIM is enough for Google Maps and translation apps. But Japan still runs a lot of services through a Japanese phone number:
- Restaurant reservations on Tabelog and OpenTable: confirmation SMS goes out the day before. No JP number, the message bounces silently and the restaurant may release your seat.
- Ride-hailing: GO and DiDi (the Japanese answer to Uber) require SMS verification at sign-up. No JP number = no app.
- Convenience-store package pickup: many e-commerce sites send a Japanese-format SMS code for konbini pickup.
- Mobile Suica / Mobile PASMO registration on Japanese app stores: occasionally requires a JP number for SMS auth.
- Restaurant queue apps (EPARK, Toreta) at popular chains: often SMS-only.
If your trip skips all of the above and you just want maps, translation, and Wi-Fi calls home, a data-only eSIM is enough. If you’ll do any of it, you save real time and real anxiety with a phone-number SIM.
We have a longer write-up on this trade-off in Japan, apparently, you actually do want a phone number — read it if you’re still on the fence.
Customer support in English
All three are English-friendly. Quick honest ranking based on documentation quality and response time in our experience:
- Sakura Mobile — Tokyo office, real humans on chat and phone, opens early. Best for “my SIM isn’t activating and I’m at the airport now.”
- Mobal — UK-based + Tokyo desk, email and chat. Slower than Sakura’s airport coverage but excellent for billing and account-level questions across a long stay.
- Airalo — global app-based support, in-app chat. Fine for the 95% case; they’re a marketplace, so deep network issues bounce you to provider-side help.
My pick — and the honest disclaimer
For most readers of this site — short-to-medium trip, want to actually book the good restaurants, occasionally use a ride app — the boring practical answer is the Mobal Voice+Data eSIM for 16-31 day trips, or the Mobal Voice+Data physical SIM if you want the SIM mailed to your home before the flight. The phone number is the feature you don’t realize you needed until you don’t have it.
If you’re a stay-on-the-tourist-trail traveler with a 5-day Tokyo + Kyoto loop and no reservations to keep, keep it simple: get an Airalo unlimited plan for your trip length (US$17 for 5 days as displayed in August 2026) — or, if a small fixed-GB bucket is all you need, an even cheaper data-only eSIM like Ubigi (our Airalo vs Ubigi comparison runs the math) — and skip the rest of this comparison.
If you’re heading to rural Japan and want the unlimited safety net, Sakura Mobile’s 4G Unlimited plan is genuinely the best in that category.
The links to Mobal and Sakura Mobile in this article are affiliate links. The recommendations are the same ones I give friends.
Closing
Japan’s mobile market for tourists looks crowded, but it sorts cleanly into three roles: the self-serve data marketplace (Airalo — now selling Japan as unlimited-by-the-day), the unlimited-with-a-support-desk specialist on Docomo (Sakura), and the phone-number specialist (Mobal). Apparently the only honest way to recommend one is to ask which of those three things you actually need.