Your visitor needs to be online the moment they land: to load a map, message you, or show a QR code at the gate. There are three sensible ways to make that happen, and the right one depends on the phone they carry and how your group travels. Here is how each works from a host's point of view, so you can set expectations before anyone gets on a plane.
The three options at a glance
An eSIM is a data plan downloaded onto the phone itself, no physical card needed. A pocket Wi-Fi is a small rented hotspot that several devices share. A spare SIM means putting your guest on a card or line you arrange. Each solves the same problem differently.
| Option | Best for | Setup | Watch out for |
|---|---|---|---|
| eSIM | One person with a modern unlocked phone | Installed before the flight, activates on arrival | Phone must support eSIM and be carrier-unlocked |
| Pocket Wi-Fi | Groups, families, or less tech-confident travellers | Rental delivered to your address, or airport pickup | One more gadget to charge and return; everyone stays near it |
| Spare SIM | Guests you host often, or a phone that takes a physical SIM | You arrange the card or plan in advance | Your guest must remove and safely keep their home SIM |
Option 1: an eSIM
For a single traveller with a recent iPhone or Android, an eSIM is the easiest path. They buy a Japan data plan online, install it over their home Wi-Fi before leaving, and it switches on automatically once they connect to a Japanese network. No card to lose, no shop to visit, no delivery to time. The two catches are simple: the phone has to support eSIM (most flagship models from the last few years do), and it must be carrier-unlocked. Ask your guest to check both while they still have time to sort it out. Data-only plans are common and fine, since messaging apps cover calls.
Option 2: pocket Wi-Fi rental
If your visitors are travelling as a group, are older, or simply are not confident fiddling with phone settings, a rented pocket Wi-Fi is the calm choice. One small device gives several phones, tablets, and laptops internet at once, and nobody has to touch their own SIM or plan. Most rental services will deliver the unit to your home address before the guest arrives, or leave it for pickup at the airport, and include a prepaid envelope for the return. The trade-offs: it is another thing to keep charged, everyone has to stay within range of the person carrying it, and it must be posted back on time to avoid extra fees. For a couple visiting together it is often cheaper and simpler than two separate eSIMs.
Option 3: a spare SIM on your own arrangement
If you host the same people regularly, or their phone only takes a physical SIM, you can arrange a card in advance so it is ready and waiting. Some carriers aimed at foreign residents and visitors offer short-term data SIMs you can hold for a returning guest. The main thing to brief them on is that they will need to remove their home SIM to insert yours, so they should keep the original card somewhere safe (the little tray tool and a labelled envelope go a long way). This option gives you the most control but the most legwork.
Named options, in general terms
Prices and plan details change constantly, so treat the following as a map rather than a quote. For eSIMs, well-known global providers include Airalo and Ubigi, alongside services that sell both Japan-specific and worldwide eSIMs. For physical SIMs and carrier plans built for foreigners, Sakura Mobile, Mobal, and Japan Wireless are common starting points. For pocket Wi-Fi, several rental companies specialise in short stays with airport and home delivery. Compare current plans and coverage for your guest's exact dates before committing.
Sakura MobileMobal SIMJapan Wireless (pocket Wi-Fi)Wi-Fi rental (delivered next day)
NetAge Wi-Fi rentalPrices and availability change; confirm on the provider's page. Checked 2026-09-07.
Whichever you pick, confirm the plan covers the full length of the stay plus a buffer day, and that data allowance suits how heavily your guest navigates and streams.
A few host tips
- Decide the connectivity plan before arrival day, and add it to your pre-arrival checklist so it does not get forgotten in the rush.
- Being online is separate from paying for trains and shops. Sort that out too with our guide to IC cards for foreign phones.
- A connected guest can follow directions on their own, which makes your notes on getting from the airport to your place far more useful.
In short: reach for an eSIM if your visitor has a modern unlocked phone and travels solo, a pocket Wi-Fi if a group needs to share one simple device, and a spare SIM if you host often enough to justify keeping one ready. All three get the job done; the best fit is the one that matches the phone in their pocket and the way they travel.
Prices and plans vary between providers and change often; details checked 2026-09-07.