USA eSIM Setup on Samsung Galaxy (One UI)
Add a USA eSIM to a Galaxy: check the EID first, install through SIM manager on Wi-Fi, and flip the right roaming switch when you land in the States.
Updated August 24, 2026
Home carriers price the United States as far away as it gets. For most travellers the American rate is the top band of the roaming table, and a fortnight of navigation, group chats and uploaded photos at that rate costs more than the trip’s meals. The obvious fixes are worse on arrival: airport Wi-Fi dies at the terminal doors, and a US prepaid SIM means finding an open store, queueing, and at some carriers producing identification at the counter.
Installing a data eSIM before you fly sidesteps all of it. The plan is bought in the USA 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 US network and not at checkout, install it the evening you pack. 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 US phone number — worth weighing in the States specifically, because local services often expect a US number for a verification text or a callback, and a data line has none to give. Your own number stays live on your own SIM. The other limit belongs to the country: coverage is excellent in urban America and along the highway network, and there are real dead stretches in the mountain west, in canyon country and inside several national parks. Nobody’s SIM changes where towers stand. Hotspot is included, so one phone can put a laptop or the rest of the car online where there is signal, and offline maps downloaded before the park entrance cover the places where there is not.
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 USA 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 US airport 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 US network, not from when you paid.
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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.
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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.
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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.
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Step 7
Name the line and leave it switched off
Call it USA 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 USA 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 US phone number?
It does not. The plan carries data only. There is no US number on it, none can be added, and your own number stays where it is. Be aware of what that rules out: some US services ask for a US number to text a verification code or call you back — food delivery, restaurant bookings, a rental car desk. Where one insists, fall back on an email login.
Will the phone have signal for the whole road trip?
In the cities, along the interstates and in most towns it will, and coverage there is excellent. Across parts of the mountain west, through canyon country and inside several national parks it is genuinely patchy. That is tower placement in a very large country, not the SIM in your phone; a local prepaid SIM would leave you in the same spot. Download offline maps for any park section of the drive 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 hotel lobby in another time zone.
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 the US 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.