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
Three things to know before you start
It connects only at your destination
Install at home, but expect “No Service” or “Activating…” until you land — that is normal. The plan wakes up when the line first finds a network at your destination.
Your QR code works exactly once
Seeing “invalid QR” after a scan almost always means the eSIM is already on your phone. Don’t rescan — open your SIM list and just switch the line on.
No internet after landing? Check Data Roaming
Turn the travel line on, set it as your mobile data line, and switch Data Roaming ON for it. This one toggle causes most “it doesn’t work” messages.
Installation steps
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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.
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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.
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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.
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Step 4
Open Settings and go to Connections
Settings Connections SIM manager
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.
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Step 5
Open SIM manager and tap Add eSIM
Connections SIM manager 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.
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Step 6
Scan the QR code, or enter the code by hand
SIM manager Add eSIM
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.
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Step 7
Name the line and leave it switched off
SIM manager eSIM 1
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.
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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.
Most home carriers treat Thailand as the far end of the roaming price list. It typically lands in the priciest tier, and two weeks of navigation, group chats and photo uploads at that rate can outprice the entire trip’s meals. Sorting it on arrival helps but is not perfect: Thailand’s airport SIM counters move fast by international standards, yet you still queue after a long-haul flight, hand over a passport, and hunt down another shop when the plan runs dry somewhere down the coast.
A data eSIM installed before departure removes all of that. Buy the plan through the Thailand eSIM app, let the line download onto the Galaxy over your home Wi-Fi, and the only step left once you land is switching it on. Since the validity clock starts at the line’s first Thai connection rather than at checkout, there is nothing lost in buying it the evening you pack, or a month ahead if the trip gets planned early. Pricing sits on pricing, and what an eSIM is covers the basics in a couple of minutes if the concept is new to you.
The tricky part with a Galaxy is never the tap sequence — that stays short and consistent. It is whether your specific unit actually has eSIM hardware. Samsung ships identical model names across dozens of markets and carriers, and some regional or carrier-specific variants quietly drop the hardware even when the same model name usually includes it, so no published list can be trusted blind. Dial *#06# on your own phone instead: an EID under the IMEI settles it in five seconds. Other handsets get their own treatment on the iPhone and general Android pages.
Two boundaries worth knowing upfront. The plan carries data only, so it comes with no Thai phone number — a holiday barely notices, since messaging apps and internet calls fill the gap, but a longer stay might, because a Thai bank account or certain local registrations expect a number a Thai network can text, and a data line simply has none to offer. Your own number keeps working on your own SIM the entire time regardless. The second boundary is geography: coverage runs strong through the cities, the towns and the main islands, and genuinely thins out in the northern mountains, inside the larger national parks and out at sea between islands. No SIM moves where the towers were built. Hotspot use is included, so a single Galaxy can carry a laptop or a fellow traveller online wherever there is signal, with offline maps downloaded ahead of any ferry crossing covering the rest.
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.
The QR code says invalid, already used, or the install fails on a second try.
An activation code is single-use, so this error almost always means the first scan already worked and the eSIM is on the phone. Do not keep rescanning. Open the phone's SIM list (the cellular or SIM manager screen) or My eSIMs in the Thailand eSIM app: if the line is listed, the install is done — turn the line on, give it mobile data and enable Data Roaming instead of installing again.
Do I have to scan the QR code at all?
No. In the Thailand eSIM app, open My eSIMs, tap your plan and tap Install — the profile installs on the same phone with no camera involved. The QR route exists for installing from a second screen; both end in the identical profile, and the steps after the install are the same either way.