Sim Local Voucher ESIMDISCOUNT10 is a 10% discount code entered at the Sim Local online checkout, taking your order down to 90% of the listed price. This article looks at the offer strictly from the terms side: who can use it, where it works, where it clearly does not, and which conditions are documented versus simply unknown. That last distinction matters more than usual here, because several of the conditions shoppers normally want confirmed in advance — minimum spend, expiry, per-customer limits — are not published anywhere, and the checkout total ends up doing the work that a terms page would normally do.
What kind of offer this is in contract terms
The word "voucher" carries a legal and practical meaning in everyday shopping that does not apply here. A voucher in the stored-value sense holds a balance, belongs to whoever holds it, and is spent down over one or more purchases. A coupon in the traditional sense is a physical instrument surrendered at a till. Neither describes ESIMDISCOUNT10.
What you have is a code string: a sequence of characters typed into a promotional field during online checkout, which instructs the system to reduce the order total by a tenth. Nothing is bought, nothing is held, nothing is transferred. That changes the terms picture in three concrete ways:
There is no balance to protect, so there is no lost-voucher problem and no expiry of a stored amount.
There is no residual value. The discount applies to the order in front of you and leaves nothing behind for a later purchase.
There is nothing to redeem at a counter, because a code needs a field to be typed into.
If you have been looking on the site for a voucher-balance page, it does not exist. The code is the whole of the offer.
Where the offer is valid — and the one place it is not
The single hardest limit on this code comes from the nature of Sim Local's business. The company sells travel SIM cards and eSIMs both online and in person. It operates airport stores, kiosks and vending machines alongside its website and apps, with airport locations named on its own site including Dublin, London Heathrow, London Gatwick, Brussels, Athens, Madrid and Copenhagen, plus partnerships at US airports. A UK airport distribution partnership with WHSmith Travel has run since 2017.
None of those physical points of sale has a field to type ESIMDISCOUNT10 into. A vending machine will not take it, a kiosk till will not take it, and staff at a counter have no mechanism to apply it. If you intend to use the code, you must buy on the website. There is no route by which an online-checkout code reaches a shop floor transaction, and no staff discretion that changes that.
Whether the code functions inside the iOS and Android apps is not documented. If the app checkout does not present a code field, the website is the safer route. That is not a restriction stated by the provider so much as an unknown you work around.
Eligibility questions with no published answer
Rather than guess, it is worth listing plainly what is not documented about ESIMDISCOUNT10:
Whether it covers every plan, including local and regional plans as well as global ones, or physical SIM cards ordered online
Whether it works in the apps or only on the website
Whether a minimum spend applies
Whether an expiry date applies
Whether there is a per-customer usage limit
Whether it is restricted to first orders only
Exactly where the code field sits on the checkout page
An absence of published conditions is not the same as an absence of conditions. A code can silently decline on an excluded product or after a usage limit is reached, and the only signal you get is a total that does not move. That is why verification at checkout is the practical substitute for a terms page here.
How the offer is forfeited
There is one way to lose this discount that is entirely within your control, and it accounts for most complaints about codes at any online store: paying before the discount has been applied. A percentage code reduces the total at the moment it is accepted. If you complete payment while the total still shows the full price, the discount has not been applied, and paying will not apply it retrospectively.
Other common ways to forfeit a code, in general online shopping terms, are worth knowing because they are easy to avoid:
Typing the string with a leading or trailing space, or with substituted characters. Enter ESIMDISCOUNT10 exactly as written.
Missing the code field entirely because it sits behind a small expandable link rather than an open box.
Changing the basket after applying the code without rechecking that the reduced total survived the change.
Buying in person after finding the code online.
What 10% is actually worth, and why the terms matter more on large orders
Because 10% off means paying 90%, the arithmetic is simple, and it shows why the eligibility questions carry different weight at different basket sizes. On the global eSIM plans listed in US dollars at the research date, the code moved a 100GB, 116-country, 31-day plan at $93.50 to about $84.15, a saving of roughly $9.35. At the other end, a 3GB, 109-country, 31-day plan at $10.50 came to $9.45, a saving of $1.05. The 12GB, 71-country, 30-day plan at $20.00 becomes $18.00; the 20GB, 72-country, 31-day plan at $35.00 becomes $31.50; the 30GB, 71-country, 30-day plan at $47.00 becomes $42.30; and the 50GB, 117-country, 31-day plan at $70.25 comes to about $63.23. Those were the prices on the research date and should be treated as indicative rather than permanent.
A flat percentage scales with the basket, so if a minimum spend or product exclusion exists but is not published, it costs you least on the small plans and most on the large ones. It also means the code never changes which plan is better value per gigabyte, because every plan is multiplied by the same factor.
One coverage detail sits outside the code but affects what you should buy. The country count does not rise with the data allowance: the 50GB plan listed 117 countries while the 30GB plan listed 71, and the smallest 3GB plan listed 109. A larger plan is not automatically a broader one. Check the destination list on the specific plan you are considering.
A checkout sequence that protects the discount
Pick the plan on the website, checking the country list on that plan rather than the headline coverage figure.
Add it to the basket and move to the payment step.
Find the field labelled for a promotional code, voucher or discount. Wording varies and it may be hidden behind a small link.
Enter ESIMDISCOUNT10 with no spaces and confirm it.
Read the new total and check it is 90% of the pre-discount figure.
Only then complete payment, and wait for the activation instructions.
Step five is the whole of the risk management. If the number has not moved, the code has not landed on that basket, and no amount of arguing after payment reconstructs it.
Refunds and what the plans include
Sim Local advertises a "No Quibble Refunds" guarantee, phrased on the site as getting your money back if you change your mind. The conditions attached to it — anything about activated versus unused plans, or time limits — are not summarised here, so read the policy page before relying on it. A discount code and a refund policy interact in an obvious way: any refund relates to what you actually paid, which with the code applied is 90% of list.
On the product side, activation happens within minutes through the app or via emailed instructions, with no physical SIM to swap. Some plans include calls and SMS while others are data-only, with voice described as available in popular destinations, so treat calling as a per-plan detail to confirm rather than a given. Network speed is 4G, 5G or 3G depending on the plan and the local network. The company advertises up to 10GB of full-speed data daily without throttling — its own claim, and a cap on full-speed data rather than an unlimited allowance. Advertised coverage is more than 150 countries and regions.
Who the terms favour
The conditions, such as they are, favour someone who was already going to buy a Sim Local eSIM on the website and who is choosing a larger global plan, where a tenth off is worth most of a ten-dollar note rather than a dollar. They work against anyone planning to buy at an airport counter on the day of travel, since the code has no way in there. For everyone else, the offer costs nothing to attempt: the code either lands or it does not, and the total on the payment page tells you which.
For background, Sim Local was founded in 2011 by Irish entrepreneur Killian Whelan, is headquartered in Dublin with a London office, and sells plans from operators including EE, Orange, Lycamobile, Three, AU (Japan), True, Digicel and Mobifone. A third-party company profile puts it at roughly 73 employees across three continents as of February 2026 and 4 million customers since 2011. Its main site is simlocal.com, with an eSIM sub-site at esim.simlocal.com — the same company rather than a separate business, which is worth knowing if you are checking you are on a legitimate page before entering a code.
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.