Thailand offers some of the best eSIM value in Asia: small allowances cost a dollar or two, generous 30 day plans are inexpensive, and unlimited plans are widely available with daily fair use thresholds of commonly 1GB to 5GB at full speed. Two networks dominate: AIS with the strongest rural and island reach, and True Move H with the fastest city speeds.
TL;DR · LAST REVIEWED 25 JULY 2026
- Small allowances cost a dollar or two; generous 30 day plans undercut most of the region
- Unlimited almost always means a daily full speed threshold of 1GB to 5GB before throttling: compare the threshold, not the word
- AIS for rural areas and smaller islands; True Move H for peak Bangkok speeds of 100 to 200 Mbps
- Regional Southeast Asia bundles cover Thailand with Vietnam, Malaysia, Singapore and Indonesia for little extra
- Tourist eSIMs are data only: a Thai number requires a local physical SIM registered against a passport
KEY FACTS
- 5G is strong in Bangkok with True Move H commonly reaching 100 to 200 Mbps; dependable 4G covers the islands
- Unlimited plan fair use thresholds commonly run 1GB to 5GB of full speed data per day
- Typical comfortable usage: 500MB to 1GB per day for maps, messaging, translation and social apps
- Regional Southeast Asia bundles cost little more than single country plans
- Local physical SIMs from AIS and True shops require passport registration
- Providers state the underlying Thai network on the plan page
What plans cost
Thailand sits at the cheap end of the global eSIM market: small allowances cost a dollar or two and a generous 30 day allowance lands under the price of a beachfront lunch per week of travel. Unlimited plans are widely available and affordable by regional standards.
The daily fair use threshold matters more than the headline word: commonly 1GB to 5GB of full speed data per day before throttling until the next day. Regional bundles covering Thailand, Vietnam, Malaysia, Singapore and Indonesia remove re purchasing at each border on the classic loop.
AIS or True underneath
Which local network the eSIM rides determines the experience more than the brand on the app. AIS reaches furthest into rural areas and the smaller islands; True Move H posts the fastest urban speeds, commonly 100 to 200 Mbps in Bangkok.
Providers usually state the partner network on the plan page. Travellers heading beyond Bangkok, Chiang Mai and the major islands lean AIS; city and resort trips barely notice the difference, and 5G spreads steadily from Bangkok outward with dependable 4G everywhere tourists go.
Practicalities
As across Asia, tourist eSIMs are data only: no Thai number, so calls run over internet apps and SMS verification to local numbers is unavailable. Installation happens over WiFi before departure, activation on landing or a set date.
The home SIM stays in for calls with its data roaming off. For stays beyond a month or heavy hotspot use, local physical SIMs from AIS and True shops with passport registration remain an alternative, at the cost of a queue on arrival.
RELATED GUIDES
DISCLAIMER
This article is editorial information, not financial advice. Kael Tripton Ltd is not authorised or regulated by the Financial Conduct Authority. Figures were correct at the last review date shown above; verify current rates and rules with the primary sources listed below before acting.
Frequently asked questions
How much data do I need for Thailand?
Maps, messaging, translation and social use typically consume 500MB to 1GB a day. A 20GB month covers most travellers comfortably; heavy video calling or hotspot use points to unlimited plans with generous daily thresholds.
Which network is better, AIS or True?
AIS for rural reach and smaller islands; True Move H for peak city speeds. Both cover the mainstream tourist map well, and the plan page states which network a given eSIM uses.
Do unlimited Thailand eSIMs really mean unlimited?
With a caveat: nearly all apply a daily full speed threshold, commonly 1GB to 5GB, then throttle until the next day. The threshold is the number to compare.
Can I get a Thai phone number on an eSIM?
Tourist travel eSIMs are data only. A local physical SIM from an AIS or True shop, registered against a passport, provides a Thai number where genuinely needed.
Does one eSIM cover a wider Southeast Asia trip?
Regional bundles covering Thailand with Vietnam, Malaysia, Singapore and Indonesia are widely available and cost little more than single country plans.
Is 5G available?
Strongly in Bangkok and increasingly in other cities, with reliable 4G across the islands. A 5G handset benefits in cities; 4G remains entirely adequate for travel use.
SOURCES
- GOV.UK: Thailand travel advice – accessed 25 July 2026
