4S eSIM vs BuyUKeSIM

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

4SBuyUKeSIM

Unlimited data ✓ Yes No

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 BuyUKeSIM

ID verification

4S: Not confirmed yet

BuyUKeSIM: 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.

BuyUKeSIM: Routine refunds aren't offered once the eSIM QR is delivered (standard for instant digital goods) - but technical delivery failures, duplicate payments, overpayments and confirmed payment errors are reviewed and fixed case by case via live chat or Telegram, TX hash required.

Validity starts

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

BuyUKeSIM: Shown per plan at checkout: validity starts on first network connection, not at purchase or QR delivery.

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.

BuyUKeSIM: Not confirmed yet

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.

BuyUKeSIM: Add a data top-up to an already-installed eSIM from your order page (8-character Magic Code) - loads onto the same eSIM, same QR/ICCID, no reinstall, repeatable. Unused data doesn't roll over past the plan's own expiry.

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.

BuyUKeSIM: QR codes are shown on-screen once and not re-sent by default. If access is lost to a genuine technical issue, contact live chat or Telegram with your payment TX hash - after verification, they'll resend once.

Billing currency

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

BuyUKeSIM: Checkout is cryptocurrency only - prices are shown in USD and the exact crypto amount is calculated at a live exchange rate locked for a short window at checkout.

Support

4S: Email · Live chat · Help center

BuyUKeSIM: Live chat · Help center · 24/7

Payment

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

BuyUKeSIM: Crypto

Headquarters

4S: Kowloon, Hong Kong

BuyUKeSIM: Not confirmed yet

Legal entity

4S: Wans Technology Limited

BuyUKeSIM: Not confirmed yet

Founded

4S: Not confirmed yet

BuyUKeSIM: Not confirmed yet

Comparison by eSIMKart

Discount codes

4S -15% ESIMKART15

BuyUKeSIM -5% ESIMKART5

4S eSIM vs BuyUKeSIM — common questions

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

Compare 4S eSIM and BuyUKeSIM by destination

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