eSIM and SIM cards in Thailand

SIM and connectivity

The decision that matters is not "which operator" but where and how you want to get online. Five categories are worth comparing: airport tourist SIM, city physical SIM, operator eSIM, international travel eSIM, and roaming with your home operator. A passport is commonly used to register a SIM in Thailand.

In Thai reality:

• The airport option is the most convenient but often not the cheapest.
• A city SIM tends to be economically the best.
• An eSIM is best for travelers who want to be online the moment they touch the runway.

Sources: AIS official, TrueMove H official, dtac official, Reddit - Thailand tourist SIM threads, TAGTHAi Easy Pay.

Pick by what you care about most:

• A hassle-free start - an eSIM or an airport kiosk.
• The lowest price - a city or local SIM in regular retail or an operator shop.
• Network certainty across the whole country - traveler reports most often recommend an AIS-based choice. Grab, Bolt and Reddit communities often note that in big cities the difference between the major networks is smaller than on the islands and away from main routes.

Treat specific prices as indicative - exact plan price lists change faster than visa rules. Sources: Reddit - network/coverage discussions, Phuket/Chiang Mai threads, CDC Thailand packing list - water purification tablets / remote travel note.

Options worth comparing

The table above is deliberately categorical: exact operator packages and local retail prices change too quickly to treat as a fixed price list.

What a tourist SIM actually costs

Prices move by sales channel more than by operator. Two independent checks in 2026 priced the same packages differently, and that spread is the useful answer: the airport counter, the operator's own app and a 7-Eleven are three different price lists.

Budget by the range, not the number: roughly 300-700 THB for a week and 900-1,200 THB for a month. Airport counters run 20-30% above the same operator's city shops, which is the single biggest difference between paying a little and paying a lot.

Buying one when you land

• Suvarnabhumi (BKK) - operator counters sit in the arrivals hall; the AIS desk is by gates 6-7. Only buy from a counter carrying the operator's own branding.
• Don Mueang (DMK), Phuket (HKT) and Samui (USM) all have operator counters in arrivals as well.
• In the city - operator shops in shopping malls, and 7-Eleven or Family Mart for the SIM itself. Convenience stores sell the SIM but activation there is fiddlier than at an operator counter.

Registration is on your passport

• Bring your passport to the counter. The SIM is registered to your name and passport number; Thai rules also involve biometric registration at the point of sale.
• Five prepaid SIMs per passport per operator is the cap, so a lost SIM is not the end of it.

Keeping your home number while you use Thai data

• A Thai SIM is a second line, not a replacement. Put the local SIM or eSIM in the data slot and leave your home SIM active for the bank and account codes that still arrive by SMS.
• Turn data roaming off on the home line and set the Thai line as the default for mobile data, or the phone quietly bills the expensive one.
• Check the phone is carrier-unlocked before you fly. A locked handset takes neither a Thai SIM nor a travel eSIM, and there is nothing to be done about it at the airport.

Practical recommendations

• Cheapest - a city physical SIM or a local operator eSIM, if you do not want to pay the airport premium.
• Easiest - an international eSIM such as Saily activated before departure, from USD 2.99 for 1 GB over 7 days.
• Best coverage - in practice often an AIS-based choice, but in Bangkok, Chiang Mai and Phuket the differences tend to be smaller than away from main routes; the exact answer depends on current crowdsourced reports and where your hotel is.
• For a 3-day trip - an international eSIM or an airport tourist pack.
• For 7 days - an airport tourist SIM if you are in a hurry; otherwise a local plan in the city.
• For 30 days - a city or local SIM, or an operator eSIM.

PAY & TOUR and QR payments as a companion to connectivity

A large part of Thailand's micro-economy runs on domestic QR payments, so a non-bank companion is worth knowing about. PAY & TOUR by KBank is an e-wallet and prepaid card for foreign tourists, and the official sales sheet states:

• Where it works - anywhere Visa is accepted, and after linking with TAGTHAi it also supports Thai QR payments.
• Top-up - at a KBank foreign exchange booth.
• Wallet maximum - 100,000 THB.
• Daily ATM withdrawal limit - 10,000 THB.
• Promotion until 31 Dec 2026 - waives both the joining fee and the K-ATM withdrawal fee.

This is a very strong use case for tourists who do not want to deal with cash all the time. Sources: KBank sales sheet, TAGTHAi - how to get Easy Pay, TAT news.