Saily Code EDC10 takes 10% off the price of a Saily travel eSIM plan, meaning you pay 90% of whatever the plan you picked is listed at. If you have never bought an eSIM before, the code itself is the easy part — it goes into the promo or discount code field at checkout, and it applies across the plan types Saily sells rather than being pinned to one country. The harder part, and the part this guide spends most of its time on, is everything either side of that box: checking your phone can take an eSIM at all, picking a plan shape that matches your trip, installing the profile before you fly, and switching it on when you land.

There is one prerequisite that overrides everything else. Your handset must be both eSIM-capable and carrier-unlocked. Most flagship phones from the last several years are eSIM-capable, but a device that is locked to a carrier may simply refuse to install a third-party profile. A discount on a plan you cannot install is worth nothing at all, so do this check before you spend a penny.

An eSIM is a SIM profile installed as software rather than as a physical plastic card. Modern phones contain a small embedded chip that can hold several profiles at once. That is why the arrangement works so well for travel: your home SIM stays active for calls and texts, while the travel eSIM carries data, and you never have to prise open a SIM tray in an arrivals hall.

Saily is the travel eSIM product from Nord Security, the company behind NordVPN and NordPass. It launched in 2023 and sells prepaid mobile data plans for travellers through a single app. Coverage is broad: figures reported across review sites range from 150 to over 200 countries and destinations, depending on how regions are counted.

For a first-time buyer, the corporate backing is worth understanding rather than skipping past. Every travel eSIM provider is essentially a reseller — it buys network capacity from local mobile operators and repackages it into plans. The radio signal you get is the local operator's, not the reseller's. What actually distinguishes one provider from another is whether anyone answers when your profile fails to activate in a foreign airport. An established parent company is a reasonable proxy for that kind of continuity, though it is not a guarantee of anything.

This is the single most useful thing a newcomer can learn. Saily sells several shapes of plan, and the gap between them is usually far wider than 10%.

The pricing logic holds across the whole 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 people overpay, and no discount code rescues that decision. Work out your itinerary honestly first, then choose the narrowest plan that covers it.

Allowance size deserves the same honesty. Maps and messaging consume far less data than video streaming. A smaller allowance at 90% of its price is a better outcome than a larger one you never finish, so resist the urge to size up simply because the code is applied.

Checkout pages very often hide the promo box behind a collapsed link near the order summary, labelled something like promo code, discount code or voucher. Tap it to expand the field. Type EDC10 exactly as written, with no spaces before or after — a trailing space pasted in from elsewhere is the most common reason a valid code appears to be rejected. Then wait for the total to update before moving to payment. Never enter card details on the assumption that the discount will be applied later; if the lower figure is not on screen, do not continue.

A 10% reduction means you pay 90% of the listed price of whichever plan you chose. On a short local plan that is a small absolute amount, because travel eSIM data is not expensive to begin with. On a longer global plan, or a larger allowance, the same percentage returns proportionally more in cash terms.

It is worth keeping the scale in perspective as a first-time buyer. The difference between a correctly chosen local plan and an unnecessarily large global plan for the same trip is typically much greater than 10%. Treat the code as a sensible final step, not as a reason to trade up a tier.

The Saily app handles the whole lifecycle — browsing plans, buying, installing, monitoring usage and topping up. Auto top-up can be configured to add data when your balance drops to a low threshold, which is genuinely useful on a longer trip where running dry mid-journey is disruptive rather than just irritating. For a first-timer it also removes the anxiety of watching a usage bar.

The Nord Security heritage shows in the security features layered onto the connection, including ad and tracker blocking. If you already run a VPN or a content blocker, the overlap is substantial, and you should not count that as an extra benefit when comparing prices.

Tethering is supported on fixed data plans. That is worth flagging because hotspot restrictions are common elsewhere in this category, and an eSIM that blocks tethering is much less useful if you travel with a laptop or a second device.

Saily is data-only. There is no phone number attached, so you cannot make or receive standard calls or SMS on it. Most travellers keep the home SIM active for those and use messaging apps for everything else — but if you rely on SMS one-time passcodes from a bank, keep that home profile enabled or you will lock yourself out of your own accounts.

Activation and management run through the app rather than a web dashboard, so the app has to be installed and working. Reviewers treat that as a mild inconvenience against providers that allow full management in a browser. If you strongly prefer managing things from a laptop, factor it in.

Unlimited plans are subject to fair usage, and speed throttling can apply after daily usage thresholds. This is standard across the eSIM industry, but it should shape expectations: unlimited here generally means unlimited at reduced speed after a threshold, not unlimited at full speed indefinitely.

The code suits anyone who was already going to buy a travel eSIM, and particularly people who would rather use one clean app than hunt for the lowest possible per-gigabyte rate. It fits travellers with an unlocked, eSIM-capable phone who want to keep their home number reachable while paying local data rates for everything else.

It is less relevant if you need calls or SMS on the travel line, if your handset is carrier-locked, or if you want browser-based management. If you travel often, compare repeat plan purchases against the Saily Ultra subscription tier on its own merits before deciding which route to apply the discount to.

For a first purchase, the order of priorities is clear: check the handset, pick the narrowest plan that covers your itinerary, size the allowance to how you actually use data, and then enter EDC10 at the last step so you pay 90% of the price rather than all of it.

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.