Saily Discount Code EDC10 applies a 10% discount to Saily travel eSIM plans, and in most cases it does exactly that with no drama. When it does not, the cause is usually mundane: a mistyped character, the wrong field, a purchase route that has no promo box on it at all, or a handset problem that stops the order long before the discount matters. This guide works through the failure points one at a time and explains what to do about each.
Start by separating two different problems
There are two things that go wrong when buying a travel eSIM, and they get confused constantly. The first is a code problem: you enter EDC10 and the total does not drop. The second is a device or plan problem: the purchase goes through fine, but the eSIM will not install, will not connect, or turns out to be the wrong product for your trip. A 10% discount on a plan you cannot use is not a saving.
Work out which category you are in before you start troubleshooting. If the price on screen has not changed, it is a code problem. If the price changed but nothing works after that, skip to the device and plan sections further down.
Code problem 1: the characters are not what you think they are
The single most common cause of a rejected code is transcription. EDC10 is five characters: three letters and two digits. The classic errors are the digit zero typed as the letter O, the digit one typed as a lowercase L or an uppercase I, and a trailing space picked up when the code was copied from a page rather than typed by hand.
A promo field usually performs an exact match against stored text. It does not guess. If you have pasted the code, delete the contents of the box entirely and type EDC10 manually, then look at what appears in the field before submitting. Autocorrect on a phone keyboard can also capitalise or alter short strings, which is another argument for checking the field visually rather than trusting the keystrokes.
Type the code rather than pasting it, to avoid invisible whitespace
Confirm the zero is a digit, not a letter O
Clear the field completely between attempts instead of editing what is there
Disable predictive text if your keyboard keeps changing the entry
Code problem 2: you are in the wrong field, or there is no field
Checkout pages carry several boxes that look similar. A referral field, a gift card or voucher field and a promo or discount field can sit close together, and a promotional code entered into a gift card box will simply be rejected as invalid. Read the label above the box, not just its position on the page.
The related issue is a purchase route with no promo box at all. Saily sells through its app and through its official website, and payment flows that hand you straight to a device wallet or an in-app payment sheet can complete the purchase before a discount field ever appears. If you cannot see a promo field, do not push the payment through and hope the discount applies afterwards. Back out, return to the plan selection, and look for the code entry step on the review or summary screen before payment is confirmed.
What to check on the summary screen
Find the order summary that lists the plan, the destination and the price.
Look for a link or collapsed row labelled promo code or discount code, which is often hidden behind a tap.
Enter EDC10 there and apply it explicitly rather than assuming it registers on blur.
Confirm the total has fallen before you authorise payment.
Code problem 3: the discount applied but you did not notice
A 10% reduction on a low-priced plan is small in absolute terms, and travel eSIM plans are not expensive to begin with. On a cheap single-country plan the difference can be a matter of pennies, which is easy to miss if you are scanning the page rather than reading it.
The arithmetic is the reliable check. A 10% discount means you pay 90% of the original price. Note the pre-discount figure, apply the code, and confirm the new total is nine tenths of the old one. If it is, the code worked and there is nothing to fix. If the total is unchanged, you have a genuine failure and should go back to the first two sections.
Code problem 4: you added the code after paying
Discount codes are almost always applied before payment is authorised, not retrospectively. Once a purchase has completed, there is generally no self-service way to reapply a code to that order. The practical fix is prevention: treat the promo field as a mandatory step in the checkout, in the same way you treat entering card details.
If you have already bought a plan without the code, the useful move is not to fight the completed order but to make sure the code goes on the next one. Saily's app handles top-ups as well as initial purchases, so there will usually be another chance.
Device problem: the order works, the eSIM does not
The most expensive mistake in this category has nothing to do with codes. An eSIM is a SIM profile installed as software onto a small embedded chip in the phone, and it requires a handset that is both eSIM-capable and carrier-unlocked. Most flagship phones from the last several years qualify, but a device locked to a carrier may refuse to install a third-party profile.
Check both of those before you spend anything, not after. A rejected profile installation on a locked phone is not something a discount code, a different plan or a support ticket will resolve for you at an airport.
Two further device-level traps are worth knowing. First, a profile is typically tied to the device it was installed on, so moving it to a different handset mid-trip is usually not possible — install it on the phone you are actually travelling with. Second, install the profile while you still have reliable home internet, ahead of departure, rather than trying to download it on arrival with no connection.
Connection problem: data is not flowing after landing
If the plan is bought and the profile is installed but you are still not getting data on the local network, the usual culprit is the other profile in the phone. Modern handsets can hold several SIM profiles at once, which is the real benefit of the technology: your home SIM stays active for calls and texts while the travel eSIM carries data. That only works cleanly if your home SIM's data roaming is switched off after arrival, so the phone routes data through the local network rather than your home carrier's roaming tariff.
A second cause is expectation rather than fault. Saily is a data-only service with no phone number attached, so standard calls and SMS do not run over it. If nothing arrives when you expect a text, that is the design, not a fault. Most travellers keep the home SIM enabled for exactly this reason, and it matters particularly if you rely on SMS one-time passcodes from a bank.
Also note that plan activation runs through the app rather than a web dashboard. If the app is missing, not signed in or not functioning, you cannot activate or manage the plan from a browser instead. Reviewers flag this as a mild inconvenience compared with providers that allow full browser management, and it becomes a real one if you delete the app to free up space before a flight.
Speed problem: unlimited is slower than expected
Unlimited options are available on some destinations and are subject to a fair usage policy. Speed throttling can apply after daily usage thresholds. This is standard across the eSIM industry, but it means unlimited generally describes unlimited data at reduced speed after a threshold rather than full speed indefinitely.
If you intend to tether heavily or stream, temper expectations accordingly. Tethering itself is supported on fixed data plans, which is worth confirming for your specific plan because hotspot restrictions are common elsewhere in the category. An eSIM that blocks hotspot use is significantly less valuable if you travel with a laptop or a second device.
Plan problem: the code worked but you still overpaid
Saily sells local plans for a single country, regional plans covering a group of neighbouring countries, global plans spanning a hundred or more countries, unlimited options on some destinations, and Saily Ultra, a subscription tier for frequent travellers bundling a monthly data allowance with travel perks. The pricing logic is consistent across the category: the wider the coverage, the higher the cost per gigabyte.
Buying a global plan for a single-country trip is the most common way to overpay, and no discount code compensates for choosing the wrong plan type. Choosing a local plan over a global one for a straightforward single-country trip will save far more than 10% ever will. Regional plans start to earn their keep as soon as your itinerary crosses a border or two.
The other half of the decision is the data allowance. Base it on realistic usage: maps and messaging consume far less than video streaming. If you do misjudge it, auto top-up can be set to add data when your balance falls to a low threshold, which is genuinely useful on longer trips where running out mid-journey is disruptive.
A short pre-purchase checklist
Most of the failures above are avoidable with two minutes of checking before you reach the payment screen. Saily is the travel eSIM product from Nord Security, the company behind NordVPN and NordPass, which launched in 2023, and the app handles the whole lifecycle from browsing to top-ups — so the tools are there, they just need to be used in the right order.
Confirm the handset is eSIM-capable and carrier-unlocked.
Pick the narrowest plan type that covers your actual itinerary.
Set a data allowance based on how you really use your phone.
Note the pre-discount total on the summary screen.
Type EDC10 into the promo or discount field and apply it.
Verify the new total is 90% of the original before paying.
Install the profile at home, on the phone you are travelling with.
On arrival, activate the plan and switch off data roaming on the home SIM.
Because promotional terms and values are set by the provider, the current conditions on the official site are the definitive reference if something still does not behave as described.
Promotional terms, eligibility and values are set by the provider and can change at any time. Always confirm the current terms on the official site before signing up or completing a purchase.