Pocket Wi-Fi for long stays in Japan: contracts without a credit card

For pocket wifi in Japan on a long stay, Sakura Mobile’s monthly plan has the loosest terms we found: ¥5,478 a month for 100 GB, no minimum term, and payment by foreign card or convenience-store cash. GTN Wi-Fi MAX is ¥5,390 plus a ¥10,000 refundable deposit. WiMAX Gigahodai Plus S starts at ¥5,280 with no contract period. Prices are from provider pages, as of October 2026.

What is pocket Wi-Fi in Japan, and when does it make sense?

Pocket Wi-Fi is a small mobile router (モバイルルーター) that turns a mobile network into Wi-Fi for your laptop, phone and other devices. Sakura Mobile’s device runs on the SoftBank 4G network, supports up to 15 devices and arrives pre-configured, so there is no SIM to install.

GTN lists the trade-offs for pocket Wi-Fi: you must charge it, many plans have data caps, speed can drop when many devices connect, and the signal can be weak indoors. Fiber avoids charging and data caps, but it needs installation and sometimes landlord approval. See our guide to home internet in Japan with English support if you will stay in one place.

Which pocket Wi-Fi plans have no long contract?

Notes on the table:

• Sakura Mobile: the activation fee is waived if you order a Monthly Voice + Data SIM at the same time. Over the monthly limit, the connection is cut off until the 1st of the next month, and there are no top-ups. Billing is postpaid, at the end of the following month.
• GTN Wi-Fi MAX: the device is free. GTN’s magazine says speed drops to 128 kbps for the rest of the day after 10 GB, with up to 300 GB a month. Its plan page doesn’t state a contract term, and GTN’s magazine says pocket Wi-Fi contracts are typically 1 to 3 years, so ask before you apply.
• WiMAX: the page doesn’t give a device price or cancellation fee. Check the cancellation page (解除料について) it links to.

Sakura Mobile’s own comparison lists other carriers with longer terms: au WiMAX with a 2-year auto-renewing contract and a ¥1,100 cancellation fee, and SoftBank with a 1-year term. We haven’t checked these against the carriers’ own sites. The comparison is written by a seller, so treat it as a lead, not a verdict.

Can I get pocket Wi-Fi without a Japanese credit card?

Sakura Mobile accepts an international credit or debit card and says you don’t need a Japanese bank account. You can also pay cash through Smart Pit at Lawson, MiniStop or FamilyMart, from the 1st to the 10th of the following month. Cash payers pay a security deposit equal to two months of the plan fee, applied to the final two bills. Card payers pay no deposit.

GTN’s billing page lists credit card, convenience-store payment, automatic bank deduction, payment at a GTN branch and bank transfer. It doesn’t say whether foreign-issued cards work. GTN’s magazine adds that debit and prepaid cards are often refused by providers in general.

WiMAX’s plan page doesn’t list payment requirements, so we can’t say whether it needs a credit card.

What ID and documents do I need?

Sakura Mobile asks for different ID depending on how you collect the device:

GTN’s magazine says you can apply for Wi-Fi MAX “with just your passport”, but its general documents section says a residence card is usually required, with the passport possibly requested alongside it. Confirm with GTN before applying. GTN also says contracts generally need a Japanese address, phone number and email address. Sakura Mobile’s comparison says docomo, au and SoftBank require a residence card to sign.

We couldn’t find a minimum remaining period of stay on any of these pages. GTN’s magazine warns that many providers want your remaining stay to be longer than the contract term. If your residence card has only a few months left, ask before you sign.

What happens if I break or lose the device?

Sakura Mobile offers insurance only at sign-up. None costs ¥0 a month and you owe full compensation. Regular costs ¥330 a month and covers 70%. Premium costs ¥440 a month and covers 100%. Without insurance, a replacement pocket Wi-Fi device is ¥30,000, and a screen is ¥10,000.

GTN’s ¥10,000 deposit is refunded after you return the router and have no unpaid bills.

Pocket Wi-Fi, SIM or fiber: which fits a long stay?

• Pocket Wi-Fi: best if you need Wi-Fi for several devices, can’t get fiber yet or move often.
• A SIM with tethering: uses your phone as the hotspot. See SIM cards for foreigners and what you need for a phone contract.
• Fiber: best for a stay of a year or more in one apartment, if your landlord allows installation.

Consumer problems with a contract can be raised with your local consumer affairs center (消費生活センター).

More guides: Home internet in Japan, SIM cards for foreigners, Phone contract as a foreigner.