Best eSIM for Thailand UK 2026: 10GB From £9

Last updated: 29 October 2026

What is the best eSIM for Thailand from the UK? As of 29 October 2026, the cheapest 10GB Thailand eSIM we can send you to is Mozillion’s Travel eSIM: £9 for 7 days or £11 for 30 days on the AIS and True Move networks. Breeze is the pick if you prefer the DTAC network, with 30-day plans of 5GB for £10, 10GB for £16 and 20GB for £26 that start on first use in Thailand. Either way, buy and install the eSIM on Wi-Fi at home before you fly, and keep your UK SIM switched on for calls and texts. This SwitchSquid guide compares both, works out the price per gigabyte, explains fair use on unlimited plans, and shows what roaming on your UK network would cost instead. Prices come from each retailer’s own Thailand page, checked on 29 October 2026. If you buy through the buttons on this page, we may earn a commission; it does not change the price you pay.

Sources: Mozillion Thailand Travel eSIM, Breeze eSIM Thailand, Breeze eSIM Asia, eSIM Comparator on UK roaming in Thailand and FCDO Thailand travel advice, all checked on 29 October 2026.

The short answer: which Thailand eSIM to buy

Most UK visitors to Thailand spend between one and three weeks there, split between Bangkok, the north and one or two islands. That pattern decides which eSIM is best value, because the allowance you need depends far more on how long you stay and how much you use maps, ride-hailing apps and video calls than on which beach you pick.

• One week, light to moderate use: Mozillion’s 10GB for 7 days at £9 is the cheapest plan in this guide that comfortably covers maps, messaging, ride-hailing and some social media. That is 90p per gigabyte.

• Two to four weeks: Mozillion’s 10GB for 30 days at £11 or 25GB for 30 days at £21. The 25GB plan works out at 84p per gigabyte, the lowest per-GB price in this guide.

• You want to buy well before you travel: Breeze says its fixed plans run for 30 days from your first connection in Thailand, and Mozillion says its eSIM activates automatically when you arrive, so with either you can buy ahead without losing days.

• You stream, tether a laptop or work remotely: Mozillion’s unlimited plans start at £20 for 7 days, but they carry a fair use allowance, so read the section on fair use below first.

• Thailand plus other countries in Asia: Breeze’s Asia eSIM covers Thailand and several neighbouring countries on one plan, with 10GB for 30 days at £24 or 20GB for £42. Check Breeze’s country list for your route before you buy.

If you are new to the idea, our guide to what an eSIM is and how it works explains the basics, and eSIM vs physical SIM covers when a plastic SIM still makes sense.

Thailand eSIM prices compared: October 2026

The table brings together the fixed-data and unlimited plans that matter for a typical Thailand trip. All prices are in pounds, taken from each retailer’s page on 29 October 2026. We worked out the price per gigabyte so you can compare plans of different sizes on the same basis.

Mozillion also sells longer unlimited plans: 15 days with a 30GB fair use allowance for £41, and 30 days with a 60GB allowance for £50. Breeze sells unlimited “Essential” day plans for Thailand, from £21 for 7 days to £44 for 15 days, and it takes 10% off when you buy two or more eSIMs in one order, which helps families and couples. Price per gigabyte for unlimited plans is worked out on the fair use allowance, because that is the amount you can use at full speed.

AIS, True or DTAC: does the network matter?

Thailand has two big mobile groups. AIS is the largest operator. True and DTAC merged in 2023 and now operate together as True Corporation, although you will still see the DTAC name, including on Breeze’s page, which says its Thailand plans run on DTAC TriNet with coverage across Bangkok, Chiang Mai, Phuket, Krabi and the main routes between them.

Mozillion’s Thailand page lists both AIS and True Move, with 3G, 4G and 5G on each. Having two networks available matters most away from the cities: on a remote island or a mountain road in the north, the eSIM can use whichever network has the stronger signal. In Bangkok and the main tourist areas, you are unlikely to notice a difference between the providers in this guide.

Two practical points are worth knowing. First, 5G only helps if your phone supports it and you are in a 5G area; most of the time you will be on 4G, which is plenty for maps and video calls. Second, hotspot sharing is included on both Mozillion and Breeze plans, so one person can buy a larger plan and share it with a travel partner’s phone or a laptop.

Is roaming with your UK network cheaper?

For most people, no. Thailand sits outside the European roaming zones that many UK monthly plans include, so using your normal SIM there usually means paying for a daily pass. eSIM Comparator, summarising the public roaming pages of UK networks in September 2026, found typical Thailand day passes of around £6 on EE, around £7 on O2’s Travel Bolt On, around £7.86 on many Vodafone plans and £7 to £8 on Three, depending on when you joined.

At £6 to £8 a day, a 7-night trip costs £42 to £56 in roaming passes, and a 14-night trip £84 to £112. Mozillion’s 10GB for 7 days is £9, its 10GB for 30 days is £11, and its 25GB for 30 days is £21. The saving is large enough that the eSIM pays for itself on day two of most trips.

There are exceptions. Some higher-tier plans include Thailand at no extra daily cost, and a few networks bundle long-haul roaming into premium tariffs. Check your network’s app before you go. Our EU roaming SIM only deals guide explains how UK roaming zones work if you are thinking of changing your monthly plan anyway.

Fair use on unlimited Thailand eSIMs, explained

“Unlimited” travel eSIMs almost always come with a fair use policy. Mozillion is clear about it: its 7-day unlimited Thailand plan has a 25GB fair use allowance, the 15-day plan 30GB and the 30-day plan 60GB. Once you pass that amount, your speed may be reduced, but the data does not stop.

That makes the unlimited plans good value only if you are likely to use most of the allowance. A useful rule of thumb from typical app usage:

• Maps, messaging, ride-hailing and browsing: usually well under 1GB a day for one person.

• Regular social media with photos and short videos: around 1GB to 2GB a day.

• Video calls home, streaming or a tethered laptop: several gigabytes a day, which is where an unlimited plan starts to make sense.

Your hotel Wi-Fi will carry most of the heavy use for many travellers. If you mainly need data while you are out and about, a 10GB or 25GB fixed plan usually costs less than unlimited. You can top up both Mozillion and Breeze eSIMs during the trip, so starting smaller is a low-risk choice.

Mozillion vs Breeze for Thailand: the honest comparison

Both providers price in pounds, include hotspot use and sell data-only plans, so your UK number keeps working for calls, texts and two-factor banking codes. The differences are in price, network and multi-country options.

• Price: Mozillion is cheaper at every allowance we compared. 10GB for 30 days costs £11 with Mozillion and £16 with Breeze.

• Networks: Mozillion lists AIS and True Move; Breeze uses DTAC TriNet. Mozillion’s access to two networks is a small advantage in rural areas.

• Start of validity: Breeze says validity starts on first use in Thailand, not at purchase, and Mozillion says its eSIM activates automatically on arrival. Either way, you can buy before you travel.

• Multi-country trips: Breeze’s Asia eSIM covers Thailand and several neighbouring countries on one plan. Mozillion sells regional bundles too; this guide prices Breeze’s Asia plan because it is the regional option linked from Breeze’s Thailand page.

• Reuse: Mozillion describes its Travel eSIM as one reusable eSIM for many destinations, so you can top it up for a later trip without installing a new profile.

We have also reviewed both brands in more depth: see our Breeze eSIM review, and for wider comparisons, our best travel eSIM deals, Airalo alternatives, Saily eSIM alternatives and GigSky eSIM review pages.

How to set up a Thailand eSIM before you fly

1. Check your phone: it must be unlocked and support eSIM. On most recent iPhones and Android flagships it does; your phone’s settings will show an “Add eSIM” option.

2. Buy the plan at home: you will receive a QR code or an install link by email.

3. Install on Wi-Fi: scan the code while you are still connected at home. Label the new line “Thailand” so it is easy to find.

4. Set your data line: before landing, choose the Thailand eSIM for mobile data and keep your UK SIM on for calls and texts only. Turn data roaming on for the eSIM line and off for your UK line, so you are not charged a daily pass by mistake.

5. Connect on arrival: the eSIM should connect once you land. Mozillion says its eSIM activates automatically on arrival, and Breeze says your 30 days start from that first connection.

The FCDO’s Thailand travel advice covers entry requirements, so check it before you travel; having data working at the airport makes arrival paperwork, ride-hailing and hotel check-in easier.

Fit summary

• Good for: UK travellers with an unlocked, eSIM-ready phone who want to avoid £6 to £8 a day in roaming charges.

• Best overall value: Mozillion 10GB for 30 days at £11, or 10GB for 7 days at £9 for a one-week holiday.

• Best for the DTAC network or a 20GB plan: Breeze, with 20GB for 30 days at £26 from first use in Thailand.

• Consider alternatives if: your phone is locked or does not support eSIM, or your monthly UK plan already includes Thailand at no extra cost.

Important conditions

• All plans in this guide are data only. Calls and texts on your UK number are charged at your network’s roaming rates, so use messaging apps over data where you can.

• Unlimited plans have fair use allowances. On Mozillion these are 25GB for 7 days, 30GB for 15 days and 60GB for 30 days.

• Breeze can show US dollars until you choose pounds; our prices are the pound prices it lists.

• Prices and allowances were checked on 29 October 2026 and can change. The price you see at checkout is the one that applies.

FAQ

What is the cheapest eSIM for Thailand?

As of 29 October 2026, the cheapest plan in this guide for a typical trip is Mozillion’s 10GB for 7 days at £9 on AIS and True Move. For longer stays, its 10GB for 30 days costs £11, and its 25GB for 30 days at £21 works out at 84p per gigabyte. Mozillion also has a 1GB, 7-day plan at £2.50 if you only need backup data.

Which network is best in Thailand, AIS or True?

AIS is Thailand’s largest operator, and True, which merged with DTAC in 2023, is the other major network. Both cover Bangkok and the main tourist areas well. An eSIM that can use both, like Mozillion’s, gives you a fallback in rural areas.

How much data do I need for two weeks in Thailand?

For maps, messaging, ride-hailing and some social media, 10GB is usually enough for one person over two weeks. If you make video calls or share data with a partner, 20GB to 25GB is safer. You can top up Mozillion and Breeze plans during the trip.

Can I keep my UK number with a Thailand eSIM?

Yes. A travel eSIM sits alongside your UK SIM, so your number stays active for calls, texts and bank security codes. Set the eSIM as your data line and turn off data roaming on your UK line to avoid a daily charge.

When should I install my Thailand eSIM?

Install it at home on Wi-Fi a day or two before you fly. Breeze says your 30 days start when you first connect in Thailand, and Mozillion says its eSIM activates automatically on arrival. Check each provider’s terms for when validity begins on its plans.

Is an eSIM cheaper than roaming in Thailand?

In most cases, yes. Typical UK network day passes for Thailand cost around £6 to £8, so a week adds up to £42 to £56. A 10GB, 7-day eSIM costs £9 with Mozillion.

Does a Thailand eSIM work for hotspot sharing?

Yes. Mozillion and Breeze both include hotspot or tethering on their Thailand plans. Sharing uses your allowance faster, so a 20GB or 25GB plan suits couples sharing one eSIM.

Final decision card

For most UK travellers, Mozillion is the best eSIM for Thailand on price: £9 for 10GB over 7 days, £11 for 10GB over 30 days or £21 for 25GB, on AIS and True Move. Choose Breeze if you prefer the DTAC network, and its Asia eSIM if Thailand is one stop on a longer trip in Asia. Prefer help choosing? Ask Squid AI which plan fits your trip.