Thailand eSIM Setup on Samsung Galaxy (One UI)
Add a Thailand eSIM to a Galaxy: check the EID first, install through SIM manager on home Wi-Fi, and flip the right roaming switch when you land.
Updated August 24, 2026
Home carriers price Thailand as far away as it gets. For most travellers it sits in the top band of the roaming table, and a fortnight of navigation, group chats and uploaded photos at that rate costs more than the fortnight’s food. The fix on arrival is real but imperfect: Thailand’s airport SIM counters are quick by world standards, and they still mean a queue at the end of a long-haul flight, a passport across the counter, and a shop to find again when the plan runs out somewhere down the coast.
Installing a data eSIM before you fly sidesteps all of it. The plan is bought in the Thailand eSIM app, the line downloads onto the Galaxy over your own Wi-Fi, and the only thing left on the ground is to switch it on. Because the clock starts at the first connection to a Thai network and not at checkout, install it the evening you pack — or a month early, if that is when the trip gets organised. Plans are on pricing, and if the idea is new, what an eSIM is explains it in two minutes.
The Galaxy-specific complication is not the tap sequence, which is short and stable. It is whether your particular unit supports eSIM at all. Samsung sells the same model names into dozens of markets through dozens of operators, and some regional and carrier variants ship without the hardware even when the model generally has it, so we will not publish a model list we cannot verify. Dial *#06# on the phone in your hand: an EID printed under the IMEI is the real answer, and it takes five seconds. Other handsets are covered on the iPhone and general Android pages.
Two limits to know now rather than later. The plan is data-only, which means no Thai phone number. A holiday rarely notices — messaging and internet calls carry it — but a long stay might: a Thai bank account and some local registrations want a number a Thai network can text, and a data line has none to give. Your own number stays live on your own SIM either way. The other limit belongs to the geography: coverage is strong in the cities, the towns and the main islands, and genuinely thin in the northern mountains, inside the big national parks and at sea between islands. Nobody’s SIM changes where towers stand. Hotspot is included, so one Galaxy can put a laptop or a travelling companion online where there is signal, and offline maps downloaded before the ferry cover the places where there is not.
Installation steps
-
Step 1
Check the phone before you buy anything
Open the dialler and enter *#06#. An EID listed under the IMEI means your Galaxy has eSIM hardware. No EID means it does not, and no setting will add one. Model names are a poor guide here, so trust your own handset over any list.
-
Step 2
Buy the plan in the Thailand eSIM app
Pick the plan that suits the trip and pay. The QR code and manual activation details land under your order immediately and stay there, which matters if the first attempt goes wrong.
-
Step 3
Install on Wi-Fi before you leave
Downloading a profile needs a working connection, and arrivals-hall Wi-Fi is a poor thing to depend on with luggage in one hand. Being early costs nothing: the plan counts from its first connection to a Thai network, not from when you paid.
-
Step 4
Open Settings and go to Connections
Connections sits near the top of the Settings list. If your build looks different, type SIM into the search box at the top of Settings — Samsung has moved this menu between One UI generations.
-
Step 5
Open SIM manager and tap Add eSIM
SIM manager lists your physical SIM and any digital lines. The button is usually Add eSIM; on older One UI versions the same thing reads Add mobile plan.
-
Step 6
Scan the QR code, or enter the code by hand
Choose the option to scan a QR code from a service provider and point the phone at the code on another screen. With no second screen, pick Enter activation code and copy the SM-DP+ address and activation code out of the app. Both install an identical line.
-
Step 7
Name the line and leave it switched off
Call it Thailand so the preferred-SIM screens are readable later, keep your home SIM set for calls and texts, and turn the new line off until you land. Nothing is consumed while it sits there.
-
Step 8
On arrival: enable it, select it for data, turn roaming on
Back in SIM manager, switch the Thailand line on and set Mobile data to it under Preferred SIMs. Then enable Data roaming for that line — on One UI the switch lives under Connections, Mobile networks — which is what lets it register on a visited network. Leave it off for your home SIM, where your own carrier is watching.
Troubleshooting
Does this give me a Thai phone number?
It does not. The plan carries data only. There is no Thai number on it, none can be added, and your own number stays where it is. For most trips that never comes up — messaging apps and internet calls do the work — but a service that must text a Thai number, a Thai bank being the classic case, needs a local SIM instead.
Will the phone have signal for the whole trip?
In Bangkok, in the towns and on the well-travelled islands, yes, and the networks there are fast. In the mountains of the far north, inside the larger national parks, on remote corners of small islands and at sea on a ferry crossing, coverage is genuinely patchy. That is tower placement, not the SIM in your phone; a local SIM would leave you in the same spot. Download offline maps for those stretches while you still have bars.
There is no Add eSIM option in SIM manager.
Either the handset has no eSIM hardware or it is carrier-locked. The dialler code *#06# settles the first question: an EID means the hardware is there. If the EID is present and the option is not, the phone is almost certainly locked to the operator who sold it, and only they can unlock it. Ask before you travel, not from a bungalow six time zones away.
The download failed partway with an error.
Usually the Wi-Fi dropped mid-transfer; occasionally the phone is locked. Get onto a stable connection, restart the Galaxy and try again. Your QR code stays valid until a profile installs successfully once, so a failed attempt has not burned it.
I am in Thailand and mobile data will not work.
In order: in SIM manager, confirm the line is on and selected as the Mobile data SIM; under Mobile networks, confirm Data roaming is enabled for it; then toggle Airplane mode to force a fresh search. If it is still dead, switch off automatic network selection, choose a network manually, let it register, and set selection back to automatic.
Does enabling Data roaming cost extra?
No. On a travel line that switch is not a billing decision — it is the permission Android needs to attach the line to a network other than its own, which is the only kind it will ever see. The switch that does cost money is the one on your home SIM, so leave that off.