4S eSIM vs GigSky

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

4SGigSky

Unlimited data ✓ Yes ✓ Yes

Regional bundles ✓ Yes ✓ Yes

Global bundles (50+ countries) ✓ Yes ✓ Yes

Cruise / at-sea plans No ✓ Yes

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 GigSky

ID verification

4S: Not confirmed yet

GigSky: 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.

GigSky: SIMs and top-ups can't be returned once sold and unused data isn't refunded; a minimally used subscription plan (under 1GB) affected by a connectivity issue may be refunded at GigSky's discretion.

Validity starts

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

GigSky: Plans are turned on by the customer when ready to travel, not automatically at purchase, per GigSky's setup flow ('Activate When You Travel, Top Up Anytime').

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.

GigSky: On Unlimited plans, GigSky may reduce speed during a single day of very heavy use (e.g. video streaming); normal speed resumes the next day. No specific data threshold or throttled speed is disclosed.

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.

GigSky: Eligible plans can be topped up anytime in the GigSky app (My Plans > Top Up), with the data added to the existing plan; not every plan supports top-ups and complimentary Visa plans can't be topped up.

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.

GigSky: If you delete your GigSky eSIM you may be able to download a replacement through the GigSky app; if you can't reinstall it, contact GigSky Support.

Billing currency

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

GigSky: You pay in the currency set in Profile Details — USD, CAD, EUR, GBP or JPY — and that is the checkout currency; crypto payments are processed in USD.

Support

4S: Email · Live chat · Help center

GigSky: Live chat · Phone · Email · Help center · 24/7

Payment

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

GigSky: Card · PayPal · Apple Pay · Crypto

Headquarters

4S: Kowloon, Hong Kong

GigSky: California, USA

Legal entity

4S: Wans Technology Limited

GigSky: GigSky, Inc.

Founded

4S: Not confirmed yet

GigSky: 2010

Comparison by eSIMKart

Discount codes

4S -15% ESIMKART15

GigSky -15% ESIMKART15

4S eSIM vs GigSky — common questions

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

Compare 4S eSIM and GigSky by destination

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