Saily sells prepaid travel eSIM data plans, and its coupon EDC10 takes 10% off. The important detail for anyone watching their bank statement is what that 10% is calculated on. A percentage discount of this type typically applies to the plan price, not to taxes or local fees that may be added at checkout. So a plan advertised at $8.99 for 3 GB has the discount applied to the $8.99 line, and any tax component is worked out separately. The order summary on the checkout page is the only reliable place to confirm the figure; check that the total has dropped by roughly 10% before you authorise payment, because the discount is not applied retroactively once payment has gone through.
Saily's prices are quoted and billed in US dollars. That covers the cheap end of the range, such as a Japan eSIM starting at US$3.99 for 1 GB or regional Asia and Oceania plans starting at around US$4.99, as well as larger allowances like 20 GB valid 30 days for $24.99 and 25 GB valid 60 days for $48.99. The Saily Ultra subscription, which gives 30 GB of high-speed data a month and then unlimited data at up to 1 Mbps, is priced on the same dollar basis.
If your card is denominated in another currency, your own bank handles the conversion. Saily's published information does not state what conversion rate is used or whether any foreign transaction fee applies, so that is a question for your card issuer rather than for Saily. It also means the discounted total you see on screen in dollars will not map exactly to the figure that later appears on your statement in pounds or euros.
At checkout you can pay by card, or with Apple Pay or Google Pay on supported devices. The order matters more than the method: the coupon field sits on the checkout page and must be used before you select how you are paying. It is collapsed behind a 'Got a coupon?' link beside the order summary, which catches people out because it does not look like an input box until you tap it.
The sequence that works is:
Search saily.com or the app for your destination country or region.
Pick the plan card with the data allowance and validity you want.
Sign in or create an account with email, Google or Apple — there is no code field at this stage.
On the checkout page, tap 'Got a coupon?' to expand the field.
Enter EDC10 exactly, with no stray spaces, and press Apply.
Check the discounted total, then choose card or a mobile wallet.
Install the eSIM profile through the in-app prompts or the emailed QR code.
Only one coupon applies per transaction, and codes do not stack with each other or, generally, with other active promotions and seasonal campaigns. That has a direct consequence for payments: if you buy a top-up later, it is a separate transaction and needs the code entered again, with its own discount calculation on that smaller amount.
Referral credits are handled differently. The US$5.00 in Saily credits awarded per successful referral sits in your account balance rather than being a coupon, so it is not the same mechanism as EDC10 and is treated separately at payment.
Several payment-adjacent points are genuinely unclear from the available material. Sources disagree on whether the code is single-use per account or can be used again on a later trip. It is not stated whether the discount is honoured on Saily Ultra subscription renewals, whether any minimum spend or plan-tier rule applies, or whether particular bundled or promotional products are excluded. Since none of this can be fixed after payment, the practical safeguard is the same each time: apply the code first, read the revised total, and only then pick your payment method.
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