Thailand eSIM vs Airport Tourist SIM: AIS, True and dtac Compared

For most UK travellers to Thailand, a travel eSIM is the easier option, because you install it at home and have data the moment you land. The airport tourist SIMs from AIS and True suit people who want a Thai phone number and don't mind registering with their passport and queueing in the arrivals hall after a long flight.

Last checked: 15 October 2026. Tourist SIM packages and airport availability change often, so check the operators' own pages before you travel.

Travel eSIM or airport SIM: the short answer

• Choose a travel eSIM if you want data as soon as you land, need it for a taxi app or hotel directions, are on a short trip, or would rather skip the passport check and the counter queue.
• Choose a Thai tourist SIM if you want a local Thai phone number, plan to use a lot of data on a longer stay, and are happy to buy it after landing.
• Either way, keep your UK SIM for bank codes. Most recent phones run a physical SIM and an eSIM side by side.

Travel eSIM vs airport tourist SIM at a glance

SimplySIM Thailand plans in GBP

Prices are from 15 October 2026. For a typical week of maps, messaging, social media and the odd video call, a fixed-data plan such as 10GB or 20GB is usually enough. For current tourist SIM packages, see the operators' own pages: AIS tourist plans, True tourist SIM and dtac tourist SIM. AIS and True both offer unlimited tourist packages, and include some calls.

Buying a SIM at Suvarnabhumi (BKK) and Phuket (HKT)

At Bangkok Suvarnabhumi, AIS and True counters are in the arrivals hall on Level 2, after customs. At Phuket, AIS and True booths are in the international arrivals hall. True says its tourist SIMs are sold at airport locations around the clock. AIS does not publish airport opening hours, so treat late-night availability as likely but not guaranteed.

Expect a wait at busy times. The bigger delay is usually immigration rather than the SIM counter. Thai media reported in August 2026 that Suvarnabhumi can see 5,000 to 6,000 arriving passengers an hour at peak. After a long-haul flight, a SIM queue on top of that is something many travellers would rather avoid.

What you need at the counter

• Your passport. Staff register the SIM to it, as Thai rules require.
• A network-unlocked phone. If your phone is locked to a UK network, a Thai SIM will not work.
• Cash or a card. Counters generally take both, but carry some baht just in case.

Thai SIM registration rules in 2026

Thailand has tightened SIM registration as part of a crackdown on phone and online fraud. According to the operators and reporting on the NBTC (the Thai telecoms regulator) measures:

• Passport registration is required for every tourist SIM. True says this is an NBTC rule.
• A limit of three SIMs per person per operator applies to foreign nationals.
• Tourist SIMs last up to 60 days and cannot be extended by topping up. After that you need to re-verify your identity, which AIS lets you do by text or in a shop.
• In-person registration: a May 2026 amendment to the NBTC rules, reported by law firm Tilleke and Gibbins, requires registration in person at a branch or authorised dealer. This may affect operator eSIMs sold online, so check the current process with the operator before you rely on one.

These rules apply to Thai SIMs. A travel eSIM from an international provider such as SimplySIM is a data-only roaming service and does not give you a Thai number. Never buy or use a Thai SIM registered in someone else's name. Thai authorities are actively targeting these SIMs, and they can be cut off without warning.

Do you need a Thai phone number?

Usually not. Most travellers use WhatsApp, LINE and other apps for calls and messages, and those work over any data connection. Grab and Bolt accounts can be set up with your UK number before you go. A local number is useful if you are staying longer, need Thai services that send codes to a Thai number, or want to make lots of local calls.

If you do want a number, a tourist SIM is the simple way to get one. You can still use a travel eSIM for the first hours after landing, then buy a tourist SIM in town if you decide you need it.

Setting up a travel eSIM for Thailand

1. Check that your phone supports eSIM and is network-unlocked, using our compatibility checker.
2. Buy your plan from the Thailand eSIM page and install it at home on Wi-Fi.
3. Leave the eSIM switched off until you land, then set it as your mobile data line and turn on data roaming for the eSIM.
4. Turn off data roaming on your UK SIM so you are not charged by your UK network.

Our dual SIM settings guide covers these steps for iPhone and Android. If you are also visiting Singapore or Malaysia, a regional plan such as Singapore, Malaysia and Thailand Unlimited 7 Day (£22.68) covers all three.

Entry rules to check before you fly

Thailand's entry rules have changed recently, so check the GOV.UK Thailand entry requirements before you travel. As of 15 October 2026:

• Visa exemption is now 30 days for UK tourists, down from 60 days, from 15 September 2026, according to the GOV.UK entry requirements page.
• The Thailand Digital Arrival Card (TDAC) is required for all foreign arrivals. You complete it online at the official tdac.immigration.go.th site within three days before you arrive. Beware of lookalike sites that charge a fee.
• Vapes and e-cigarettes are illegal to possess or use, with no exceptions for tourists, according to GOV.UK.

Save the emergency numbers before you go: 191 for police, 1155 for the Tourist Police, 1669 for an ambulance and 199 for fire (GOV.UK getting help).

FAQs

Why choose a travel eSIM over an airport SIM in Thailand?

You can install it at home and have data as soon as you land, without a passport check or a counter queue. It also leaves your UK SIM in place for bank texts. An airport tourist SIM is the better choice if you need a Thai phone number.

Do I need my passport to buy a SIM in Thailand?

Yes. Thai rules require every SIM to be registered to the buyer's passport, and foreign nationals are limited to three SIMs per operator.

Can I buy a SIM at Bangkok airport at night?

True says its tourist SIMs are sold at airport locations around the clock. AIS does not publish airport hours. A travel eSIM installed before you fly avoids the question.

Will a travel eSIM give me a Thai phone number?

No. Travel eSIMs like SimplySIM's are data only. Keep your UK SIM for calls and texts, and use apps such as WhatsApp or LINE for calls over data.

Does my phone need to be unlocked?

Yes, for both options. A phone locked to a UK network will not accept a Thai SIM or a travel eSIM. Contact your network to unlock it before you travel.

Which network is best in Thailand?

AIS and True (which now includes dtac) both have wide 4G and 5G coverage in cities and tourist areas. SimplySIM's Thailand plans use AIS, TrueMove H and dtac, depending on the plan.