Can I use the eSIM the moment I reach the airport in New York or LA?

Yes. If you install your Yeohaengyusim eSIM in Korea before departure, it links up automatically with the T-Mobile network right after landing at a major US airport such as JFK, LAX or ORD. You don't need to look for airport Wi-Fi or queue at a SIM kiosk: you can call an Uber as soon as you come out of immigration.

The United States is huge. Does data work in national parks and rural areas too?

The T-Mobile and AT&T networks cover about 93% of the United States, but in remote mountain and desert areas such as the backcountry of the Grand Canyon, deep inside Death Valley or the outer trails of Yellowstone, the signal can be weak or drop out. Before visiting a national park, it pays to save Google Maps offline maps and trail information in advance.

Do I need a lot of data to use Uber or Lyft in the United States?

Uber and Lyft use real-time location tracking and map data, so a stable internet connection is essential. If your data drops while you are trying to find your driver in the airport pickup zone in particular, it can cause real inconvenience. A Yeohaengyusim eSIM connects as soon as you land, so you can use it without worry from your very first Uber request at the airport.

The East and West Coasts of the United States are in different time zones. Does that affect using the eSIM?

Time differences have no effect on using the eSIM itself. However, the mainland United States alone is divided into 4 time zones: Eastern (UTC-5), Central (UTC-6), Mountain (UTC-7) and Pacific (UTC-8). New York is 14 hours behind Korea, and LA is 17 hours behind. If your itinerary crosses several time zones, it is convenient to turn on automatic time setting on your smartphone.

Are US power sockets different from Korea's? How do I charge my devices?

The United States uses Type A/B sockets. Unlike Korea's round pins (Type C/SE), they take two flat pins, so an adapter is essential. The voltage is also different, at 110V compared with Korea's 220V, so you need to check in advance whether your charger or electronic devices support 100–240V dual voltage. Most smartphone chargers these days are dual voltage, so an adapter alone is enough. We recommend buying one in advance at the duty-free shops or convenience stores at Incheon Airport.

Does eSIM work in United States?

United States supports eSIM, and plans start from ₩2,697. Install it with the QR code you receive after buying, then just turn on data roaming after you arrive and you are connected straight away. There is no need to swap your SIM.

Travel eSIM or carrier roaming: which is cheaper for a trip to United States?

For a short trip or light data use, a travel eSIM is usually cheaper. Unlimited roaming from Korean carriers costs about ₩11,000–₩15,000 a day, but with an eSIM you can buy just the days of data you need in advance. For a short trip for one or two people, an eSIM has a big advantage; for a family or very heavy data use, compare carrier unlimited roaming too.

Which carrier network does a United States eSIM use?

In United States it connects automatically to local carrier networks such as T-Mobile · AT&T · Verizon (4G/LTE, 5G where supported). Population coverage is about 93%. It picks the network with the strongest signal automatically, so there is nothing to set up.

Can I keep using my Korean number while travelling in United States?

Yes. The eSIM works as a data-only second line, so your Korean SIM and number stay as they are. Use the Yeohaengyusim eSIM for data only, and keep receiving calls, texts and KakaoTalk on your Korean number.

Can I add to or extend my United States eSIM plan?

Yes. When you use up your data or the plan period ends, you can buy a new plan at any time. Keep using the eSIM profile you already installed; there is no need to install it again, so you carry on without interruption.

Can I use tethering (hotspot) in United States?

Yes. In United States you can share your eSIM data with other devices such as a laptop or tablet by tethering (hotspot). Shared data also comes out of your plan allowance, so if you tether a lot we recommend choosing a little more data.

Do I set up the eSIM before I leave or after I arrive?

We recommend installing it (registering the QR code) before you leave, while you have Wi-Fi. Data starts when you turn on data roaming after you arrive in United States. Just remember "set up before you leave, switch on when you arrive" and you can use the internet as soon as you land.

United States eSIM plans

Instant delivery

A travel eSIM for United States starts from ₩2,697 and works as soon as you buy it. In United States it connects automatically to local networks such as T-Mobile · AT&T · Verizon (4G/LTE, 5G where supported), with population coverage of about 93%. Install it with the QR code before you leave and you can use the internet as soon as you land, with no roaming setup. Guam and Saipan have separate coverage, so check whether your US plan includes them. Hawaii is usually included in mainland US plans.

Sent instantly by email
30-day refund
Customer support in Korean
Credit card · Apple Pay

United States eSIM at a glance

Price: From ₩2,697
Local networks: T-Mobile · AT&T · Verizon
Network: 4G/LTE & 5G
Activation: QR code — install before you leave
Recommended data: Maps and messaging 1 GB a day · more room 2 GB a day · video: unlimited

eSIM plans you can use in United States

Data	Validity	Price
Unlimited	1 day	₩2,697
Unlimited	3 days	₩9,779
Unlimited	5 days	₩15,806
Unlimited	7 days	₩21,834
Unlimited	10 days	₩30,121
Unlimited	15 days	₩44,436
Unlimited	30 days	₩87,380
1 GB	7 days	₩3,752
2 GB	15 days	₩6,012
3 GB	30 days	₩8,272
5 GB	30 days	₩12,793
10 GB	30 days	₩23,340
20 GB	30 days	₩36,148
50 GB	30 days	₩52,723

The United States is a destination with everything in the world packed into one country. The dazzling night skyline of Manhattan in New York, the glittering Las Vegas Strip, the overwhelming natural grandeur of the Grand Canyon, the Hollywood vibe of Los Angeles — wherever you go, there are scenes you simply cannot resist photographing. But the country is so vast that losing your data connection on the move can leave you truly stuck. If you need to call an Uber and the internet does not work, or you cannot find your accommodation's address on Google Maps, your trip becomes exhausting in an instant. If you install a Yeohaengyusim eSIM in Korea before departure, you are connected right after landing at LAX or JFK. No SIM swap, no queue at an airport kiosk: start your trip to the United States lightly from the very first step.

Flight time from Korea

About 10–13 hours (direct flight, varies by destination)

Time difference

New York is 14 hours behind Korea, LA is 17 hours behind

Best season to go

April–June, September–November (spring and autumn, varies by region)

Plug type

Type A/B (adapter needed, 110V)

Why you need a travel eSIM for the United States

The United States is one of the largest countries in the world. From New York in the east to Los Angeles in the west takes more than 5 hours by plane alone, and whether you are travelling between cities or driving through national parks and desert routes, there will certainly be moments when an internet connection feels like a lifeline. Calling an Uber or Lyft, checking Airbnb check-in instructions, Google Maps navigation — almost everything about a trip to the United States depends on smartphone data. If you simply use roaming from your Korean carrier, the charges can easily exceed 10,000 won a day, and buying a SIM card in the arrivals hall means the hassle of filling in a contract in English. A Yeohaengyusim eSIM is easy to buy in Korean, and a single QR code takes care of the installation. Based on the T-Mobile network, it provides 93% coverage across the United States, with 5G speeds supported in major cities. It connects reliably not only in big cities such as New York, LA, Chicago and Miami, but also near national parks like Yellowstone and the Grand Canyon. Leave your existing Korean SIM as it is and simply activate the eSIM in addition, and you will not miss anything coming to your Korean number. To roam the vast United States to your heart's content, a Yeohaengyusim eSIM is all you need.

Network coverage in United States

Carrier

T-Mobile

+ AT&T

Network

4G/LTE & 5G

Coverage

93%

How do I install a United States eSIM?

1
Buy a plan
Choose a data plan for United States and complete payment.
2
Scan the QR code
Open the email we sent and point your phone camera at its QR code.
3
Install the eSIM
Complete the eSIM installation as prompted. Doing it before you leave is simplest.
4
Connect on arrival
Once you land in United States, switch data roaming on and you're online.

1
Buy a plan
Choose a data plan for United States and complete payment.
2
Scan the QR code
Open the email we sent and point your phone camera at its QR code.
3
Install the eSIM
Complete the eSIM installation as prompted. Doing it before you leave is simplest.
4
Connect on arrival
Once you land in United States, switch data roaming on and you're online.

Which plan is right for me?

Short trip

For a short 3–7 day trip, an unlimited data plan is ideal.

Business trip

We recommend a high-data plan with plenty for video calls and email.

Long stay

Staying a month or more? A large-data plan gives the best value.

Family trip

Families sharing a connection across multiple devices should pick a tethering-enabled plan with a generous data allowance.

eSIM, local SIM or pocket Wi-Fi: what suits a trip to United States best?

	eSIM	Local SIM	Pocket Wi-Fi
Activation	Instant (QR code)	Buy locally	Pick up / delivery
Setup	2 minutes	SIM swap needed	Separate device
Price	From ₩2,697	₩10,000~50,000	₩5,000~15,000/day
Network	Local 4G/LTE	Local 4G/LTE	Local 4G/LTE
Devices	1 smartphone	1 smartphone	Up to 5
Flexibility	Top up any time	Fixed data	Daily rental
Best for	Ideal for travellers	Long stays	Families / groups

How about these destinations?

Canada

Greenland

China

France

Italy

Japan

Mexico

Saudi Arabia

Spain

Thailand

Turkey

United Arab Emirates

See all North America eSIMs Canada eSIM Mexico eSIM eSIM installation help eSIM vs carrier roaming — which is cheaper?How many GB of eSIM data do I need?Best travel eSIM — how to choose

United States eSIM FAQ

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