Which SIM for a trip abroad from Thailand: AIS, True, dtac or a foreign eSIM

This comparison is based on what AIS, True and dtac publish on their own pages as of October 2026, not on a test trip. Packs and rules change, so the table below compares how each path works and leaves prices to the current pack in the operator app.

The three paths at a glance

Roaming on your own number

AIS Ready2Fly runs on your existing AIS number. True and dtac customers use the GO Travel roaming packs on their current True or dtac number. One SIM stays in the phone, and the number people already call remains reachable.

The thing to read is how the packs are grouped. Check whether your destination sits inside the pack's country group or zone, and what happens once the pack's data runs out. Both operators publish these terms in their apps and on their sites, and they get revised, so check the current pack before you fly.

Thai travel SIMs with a separate number

AIS SIM2Fly comes as an eSIM and as a physical SIM, and customers of any Thai network can use it. It is a separate AIS prepaid number. The range covers country packs, Asia & Australia, worldwide, Ultimate tiers with calls, SMS and in-flight use, and a 365-day annual SIM.

True sells GO Travel SIM as a physical SIM and an eSIM, with Asia & Australia and worldwide zones. GO Travel MyPlan is the eSIM where you pick the countries, days and data yourself. Any Thai network customer can buy it, and it is a separate TrueMove H prepaid number. The store page lists these MyPlan conditions.

• No calls or SMS bundled
• Not usable on ships or planes
• Speed drops to 128 Kbps after the quota
• The number is suspended after 180 days without a top-up

What happened to dtac GO INTER

Older articles still mention dtac GO INTER. The dtac GO INTER pages now redirect to True's GO Travel SIM page, and True Corporation sells one roaming brand, GO Travel, to both True and dtac customers. If advice tells you to look for GO INTER, look for GO Travel instead.

If you need to call the operator, True's call centre is 1242 (free from abroad at +66 99 998 1242) and dtac's is 1678 or +66 2 202 8100.

Foreign travel eSIMs

A foreign travel eSIM is a data plan for the country you are visiting. It is data only, with no phone number. Brands differ in pricing model (fixed GB, a daily cap, or unlimited that slows past a threshold), hotspot rules and top-up options, so compare plans for your exact travel dates.

This website sells eSIMs too, so treat it as one seller among the options and compare others as well. Plans are priced in THB, no app is needed (the QR arrives by email), support is in Thai, English and Chinese, and you can request a refund yourself within 14 days if the eSIM has not been installed.

A point that is easy to forget: a foreign eSIM has no number, so bank OTP messages still go to your Thai SIM. Keep that SIM in the phone and set it up for receiving messages abroad; the related guides at the end cover the details.

ID checks, the 60-day window and activation

• AIS SIM2Fly: the eSIM installs by QR or automatically through myAIS, and self-registration needs a Thai ID card. Days count from the first data connection abroad. Once the SIM is opened it must be used abroad within 60 days or the bundled pack is lost. You can open it in Thailand or abroad.
• GO Travel MyPlan: you register through an emailed link, complete a face scan and Thai ID check, then receive the QR. Use it abroad within 60 days of scanning. Days are counted in 24-hour cycles from the first connection abroad.
• Roaming packs on your own number: there is no new SIM to register; follow the pack subscription steps in the operator app.
• Foreign eSIMs: the window differs by brand. Nomad must be activated within 60 days, Ubigi within 6 months of purchase, and Airalo states no fixed deadline but networks may recycle an unused eSIM, often 90 days from purchase.

Tempat membeli

The SIM2Fly eSIM is opened through myAIS and AIS's SIM2Fly page; for the physical SIM, check that page for current sales points. GO Travel SIM has separate buy links for True and dtac customers on True's GO Travel page, and MyPlan is sold through True's online store. Foreign eSIMs are bought online at any hour, which suits a late decision.

Which path suits which trip

• You want your existing number reachable and no extra registration: a roaming pack on your own number.
• You want a separate Thai number, or the Ultimate tier with calls and SMS, and are ready for the ID step: a Thai travel SIM.
• You need data only, buy close to departure and want a plan matched to the country and number of days: a foreign eSIM, with the Thai SIM kept for OTP.

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