Last updated: Wednesday 21 October 2026 (Europe/London).
Next update: weekly, and whenever Mozillion, WorldSIM or Breeze change a price or an October code.
By: Switch Editorial Team, Switch Squid Ltd
As of 21 October 2026, the best-value travel eSIM we found for a two-week trip outside Europe is Mozillion’s 10GB, 30-day eSIM: £11 for the USA or Thailand and £12 for Turkey, or about 10% less with code WINTERSUN this October. For several countries on one trip, WorldSIM’s International eSIM Pro covers 195+ countries with credit from £15. The catch: travel eSIMs are data-first, so check whether you also need calls, and remember most UK networks already include EU roaming.
This SwitchSquid guide puts the price first. Below you get the top picks, a comparison table with codes and who each eSIM suits, and simple advice on how much data to buy.
We may earn a commission if you buy through links on this page. It doesn’t change the price you pay.
Top picks this month
Cheapest for the USA: Mozillion USA 10GB for 30 days, £11, with Code: WINTERSUN for 10% off.
Short trips: Mozillion 1GB for 7 days from £2.50 (Thailand) or £3 (USA and Turkey).
Multi-country trips: WorldSIM International eSIM Pro, 195+ countries with a UK number, credit from £15.
Group trips: Breeze, which takes 10% off when you buy two or more eSIMs, or 30% off one eSIM when you buy three or more with Code: HALFTERM30.
Mozillion USA travel eSIM — 10GB for 30 days, £11
10GB of data for 30 days in the USA for £11 (checked 21 October 2026), with smaller plans from £2 for 500MB for one day
Code WINTERSUN takes 10% off any Mozillion travel eSIM as an October offer, which brings the 10GB plan to about £9.90
Main limitation: these are data plans, so calls and texts still use your UK SIM and its roaming charges
View this deal Code: WINTERSUN
Which travel eSIM is best this month?
For a single-country trip outside Europe, Mozillion’s travel eSIMs were the cheapest we found on 21 October 2026. Its 10GB, 30-day plans cost £11 for the USA and Thailand and £12 for Turkey, which is enough for maps, messaging and some social media over a fortnight. Smaller passes start at £2 for 500MB for one day in the USA and £2.50 for 1GB for seven days in Thailand.
The October code WINTERSUN takes 10% off any Mozillion travel eSIM. Mozillion lists coverage in around 200 destinations, including Spain, Thailand, Turkey and the USA, and region plans for Europe and Asia start from £2, with a global plan from £4.
If your trip crosses several countries, or you want to keep a UK number for incoming calls, WorldSIM’s International eSIM Pro is the more flexible choice. It works in 195+ countries and you buy credit of £15, £35, £50 or £100. The £15 op
Travel eSIM deals compared
Prices are from each provider’s own website on 21 October 2026. Codes apply at checkout, before payment.
Brand | Offer | Data | Validity | Code | Upfront | Best for |
|---|---|---|---|---|---|---|
Mozillion (USA) | £11 (about £9.90 with code) | 10GB | 30 days | Code: WINTERSUN (10% off, October) | £11 one-off | A fortnight in the USA |
Mozillion (Thailand) | £11 (about £9.90 with code); 1GB for 7 days £2.50 | 10GB | 30 days | Code: WINTERSUN | £11 one-off | Long-haul holidays in Asia |
Mozillion (Turkey) | £12 (about £10.80 with code); 1GB for 7 days £3 | 10GB | 30 days | Code: WINTERSUN | £12 one-off | Turkey, which is outside EU roaming |
WorldSIM International eSIM Pro | Credit of £15, £35, £50 or £100 | Up to 10GB, 20GB, 41GB or 85GB, by country | 30 to 365 days, by credit | No code needed | From £15 credit plus a £10 eSIM charge on the smallest option | Multi-country trips and keeping a UK number |
Breeze | 10% off two or more eSIMs; 30% off one eSIM when you buy three or more | Varies by country | Varies by plan | Code: HALFTERM30 (three or more eSIMs) | Varies | Families and groups |
WorldSIM International eSIM Pro — 195+ countries, credit from £15
One eSIM with a UK number that works in 195+ countries, with credit options of £15, £35, £50 or £100 (checked 21 October 2026)
Total cost for the smallest option: £15 credit plus a £10 eSIM charge. The £50 and £100 options include a free eSIM and bonus credit
Main limitation: data allowances vary by destination, so check your countries before you buy
Do you need a travel eSIM for Europe?
Often not. Many UK SIM only plans include EU roaming, either free or for a small daily charge, so check your own plan before you buy anything. A travel eSIM makes most sense for countries your network treats as expensive: the USA, Turkey, Thailand, the UAE and much of Asia and Africa. If your network does charge for Europe, Mozillion’s Europe plans start from £2. Our guide to EU roaming SIM only deals lists the networks that include Europe.
How much data do you need abroad?
Weekend city break: 1GB to 3GB covers maps, messaging and a few photos.
One to two weeks: 10GB is comfortable for most people who use hotel Wi-Fi in the evenings.
Working abroad or streaming: 25GB or more. Mozillion’s USA 25GB, 30-day plan is £25.
Buying slightly too much is usually cheaper than topping up mid-trip, but buying far too much wastes money because travel data does not roll over.
Best travel eSIM for families and groups
Breeze suits groups. Its website takes 10% off when you buy two or more eSIMs, and its half-term code HALFTERM30 takes 30% off one eSIM when you buy three or more. That makes it worth comparing for a family trip, especially if each person needs a different allowance. Breeze sells data-only eSIMs, so you keep your normal SIM for calls and texts.
How to set up a travel eSIM
Check your phone supports eSIM and is unlocked. Most iPhones from the XR onwards and recent Samsung and Google phones do.
Buy the plan before you leave and scan the QR code at home on Wi-Fi.
When you land, switch mobile data to the travel eSIM and turn data roaming off on your UK SIM.
Keep your UK SIM on for calls and texts if you need them, and check its roaming charges.
Want a UK SIM that also roams well? Squid AI can suggest a plan for your usage, and our best SIM only deals this month guide covers UK plans. If you are travelling over the festive period, our Christmas travel eSIM guide compares eSIMs with network roaming add-ons.
Frequently asked questions
What is the cheapest travel eSIM for the USA?
On 21 October 2026, Mozillion’s USA eSIM was the cheapest 10GB, 30-day plan we found at £11. Code WINTERSUN takes 10% off this October, which brings it to about £9.90. Shorter passes start at £2 for 500MB for one day.
How do I use the WINTERSUN code?
Choose a Mozillion travel eSIM, then enter WINTERSUN in the “Got a voucher code?” box at checkout and select Apply Code before you pay. Mozillion lists it as 10% off any travel eSIM this October. Codes cannot be added after the order is placed.
Will a travel eSIM replace my UK number?
No. Most travel eSIMs, including Mozillion’s and Breeze’s, are data only, so your UK SIM stays active for calls and texts. WorldSIM’s International eSIM Pro is different because it comes with its own UK number for calls.
Do I need a travel eSIM in Europe?
Usually not if your UK plan includes EU roaming. Check your plan’s roaming terms first. Turkey is not part of EU roaming on most UK plans, so a travel eSIM is often worthwhile there.
Can a family use one travel eSIM deal?
Each phone needs its own eSIM. Breeze takes 10% off when you buy two or more, and its code HALFTERM30 takes 30% off one eSIM when you buy three or more, which suits family trips.
Does my phone support eSIM?
Most recent iPhones, Samsung Galaxy S and Google Pixel phones support eSIM, and the phone must be unlocked. Check in your phone’s settings under mobile or cellular, where you will see an option to add an eSIM.
Our verdict
For a single long-haul destination, Mozillion’s 10GB, 30-day eSIM at £11 to £12, with 10% off using WINTERSUN this October, is the best value we found. Choose WorldSIM if you are visiting several countries or want a UK number abroad, and Breeze if you are buying for a group.
Mozillion travel eSIMs — around 200 destinations, 10% off with WINTERSUN
Plans from £2 in Europe, Asia and the USA, and a global plan from £4 (checked 21 October 2026)
10GB for 30 days: £11 for the USA and Thailand, £12 for Turkey, before the October code
Main limitation: data only, and travel data does not roll over, so buy the allowance you expect to use
Check availability Code: WINTERSUNtion carries a £10 eSIM charge, while the £50 and £100 options include the eSIM free with bonus credit, according to WorldSIM on 21 October 2026.
