4S eSIM vs Japan Wireless

At a glance

Whole-catalog figures — every active plan each provider sells today.

Price check in popular destinations

The cheapest plan each provider sells for two realistic trip sizes, in the destinations both cover that travelers check most. Every price is a live plan you can buy.

Plan types on offer

4SJapan Wireless

Unlimited data ✓ Yes ✓ Yes

Regional bundles ✓ Yes No

Global bundles (50+ countries) ✓ Yes No

Cruise / at-sea plans No No

Pay as you go No No

Comparison by eSIMKart

Policies compared

Confirmed from each provider's own site — see the trust card on each provider page for the verification date.

4S Japan Wireless

ID verification

4S: Not confirmed yet

Japan Wireless: Not required

Refund policy

4S: Refund eligibility is reviewed case-by-case based on order/eSIM status and reason — no fixed window stated; contact support to request review.

Japan Wireless: eSIM orders can't be cancelled or refunded once dispatched (erroneous shipments excepted); pocket WiFi rentals cancel free before shipment.

Validity starts

4S: Most plans start counting on first use, when the eSIM connects and begins using data (checked on your 4S service page).

Japan Wireless: Validity starts when the eSIM is actually activated, not at purchase, counted in 24-hour days; it must be activated within 30 days of purchase or it expires.

Fair-use limit

4S: Unlimited plans include a high-speed data quota for the full validity period; after it is used, speed drops to up to 1 Mbps until the plan expires.

Japan Wireless: 4G Unlimited (DOCOMO) throttles to 256kbps after 3GB/day, resetting at midnight JST; 5G Unlimited (KDDI) has a general fair-use policy with no fixed daily cap stated.

Top-ups & rollover

4S: Self-serve top-up (same destination/region only) adds high-speed data to the current plan and extends its validity by the top-up package's own validity period.

Japan Wireless: Existing eSIMs cannot be topped up; extra data requires purchasing a new/additional data plan, per Japan Wireless's own FAQ.

Lost device / reinstalling

4S: Each eSIM QR/activation code can only be installed once; a deleted eSIM usually cannot be reinstalled with the same code — contact support for a replacement.

Japan Wireless: A Japan Wireless eSIM can only be installed once -- if you delete it from your device after installation you cannot reinstall it, and must contact Japan Wireless customer support for help.

Billing currency

4S: Checkout supports multiple currencies (USD, EUR, GBP, JPY, CNY and others via a currency selector); USD is the default.

Japan Wireless: Checkout lets you choose your billing currency (USD, EUR, GBP, AUD, CAD, JPY, KRW and more) via a currency selector.

Support

4S: Email · Live chat · Help center

Japan Wireless: Live chat · Email · Phone · 7 days a week, support team based in Japan

Payment

4S: Google Pay · Alipay · Card · PayPal · Crypto

Japan Wireless: Card · PayPal · Apple Pay · Google Pay

Headquarters

4S: Kowloon, Hong Kong

Japan Wireless: Tokyo, Japan

Legal entity

4S: Wans Technology Limited

Japan Wireless: Inbound Platform Corporation

Founded

4S: Not confirmed yet

Japan Wireless: 2015

Comparison by eSIMKart

Discount codes

4S -15% ESIMKART15

Japan Wireless -15% ESIMKART15

4S eSIM vs Japan Wireless — common questions

Figures on this page come from both providers' live catalogs and are re-checked automatically every day.

Compare 4S eSIM and Japan Wireless by destination

Head-to-head prices for the destinations travelers check most.