4S eSIM vs Flysimio

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

4SFlysimio

Unlimited data ✓ Yes ✓ Yes

Regional bundles ✓ Yes ✓ Yes

Global bundles (50+ countries) ✓ Yes ✓ Yes

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 Flysimio

ID verification

4S: Not confirmed yet

Flysimio: Not confirmed yet

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.

Flysimio: 7-day money-back guarantee: full refund, no questions asked, if you contact them within 7 days of purchase and have used less than 100 MB of data (a genuine connectivity test won't come close to that). After 100 MB, refunds are only for a real fault — QR/activation never arrived, a verified technical fault, undisclosed device incompatibility, or the coverage/data advertised not being delivered. Unused data does not roll over and is not refunded once the plan is running.

Validity starts

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

Flysimio: You can buy any time — plans have 6 months to activate, and validity only starts once your phone connects to the destination network (check each plan card for the exact window).

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.

Flysimio: Fixed-data plans aren't throttled; daily-unlimited plans slow to 1 Mbps after the daily high-speed cap (FAQ: 5 GB/day; the per-plan cap is on each plan card), with no hard cutoff.

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.

Flysimio: Top-ups are instant via the account dashboard — same eSIM, no re-installation needed.

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.

Flysimio: QR codes are single-use; if you delete the eSIM by mistake or switch phones, contact support with your order reference and ICCID and they'll re-issue / re-provision it instead of selling a new one.

Billing currency

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

Flysimio: Prices are shown in USD by default; your bank handles any FX conversion at its standard rate (no extra markup from Flysimio).

Support

4S: Email · Live chat · Help center

Flysimio: Email · Help center · Email replies within 24 hours (usually faster)

Payment

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

Flysimio: Not confirmed yet

Headquarters

4S: Kowloon, Hong Kong

Flysimio: Not confirmed yet

Legal entity

4S: Wans Technology Limited

Flysimio: KRAFA LLC

Founded

4S: Not confirmed yet

Flysimio: Not confirmed yet

Comparison by eSIMKart

Discount codes

4S -15% ESIMKART15

Flysimio -10% ESIMKART10

4S eSIM vs Flysimio — common questions

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

Compare 4S eSIM and Flysimio by destination

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