My experience using an eSIM in the USA

I used an eSIM during a three-week trip across the USA, starting in New York, then heading out for a Utah national parks road trip, and finishing with a few days in Los Angeles.

Because honestly, I did not want to land and deal with buying a SIM card. I also did not want to pay for roaming every day for three weeks, especially when I knew I would be using maps, rideshare apps, hotel bookings, park routes, and photo backups a lot.

For this trip, I tested an Ohayu eSIM for the USA. This is not a full comparison of every eSIM provider. It is just what actually happened when I used one on a real USA trip – in cities, on road days, and around national parks where the signal can disappear quickly.

Why I used an eSIM for my US trip

The main reason was simple: I wanted mobile data ready before I landed.

I bought the plan online before the flight, installed it on my phone, and left my normal SIM in place for calls and texts. That mattered because I still wanted access to bank verification codes, WhatsApp, iMessage, and anything linked to my usual number.

A local SIM would probably have worked too, but I did not want to queue at the airport, show ID, compare plans after a long flight, or swap anything physical in my phone.

Here is how the options felt for this trip:

Option	Setup	Keeps home number active	My take
eSIM	Before the flight	Yes	Best fit for this trip.
Local SIM card	Store or airport kiosk	Usually no	Fine, but not worth the extra stop for me.
Roaming	No setup	Yes	Easy, but expensive for a long trip.

The eSIM was not perfect everywhere, but it solved the boring part of travel: landing, opening maps, messaging someone, ordering a ride, and not thinking about data straight away.

How the setup went

Setup took around five minutes.

I installed the eSIM before leaving, but I did not use it as my main data line until I arrived in the USA. Once I landed, I switched mobile data to the eSIM profile and kept my home SIM active for calls and texts.

The one setting I always check is roaming on the home SIM. I turn that off before flying, because I do not want my usual provider quietly charging me while the travel eSIM is also running.

On iPhone, I used:

Settings > Cellular > Cellular Data

On Android, the path is usually:

Settings > Network & Internet > SIMs

The wording changes a little by phone model, but the idea is the same: keep the home SIM for calls if needed, and use the eSIM for mobile data.

Where the eSIM worked well

New York

New York was the easiest part of the trip for mobile data.

I used maps, subway directions, WhatsApp, restaurant bookings, Google searches, and Uber without thinking much about the connection. The only times it felt slower were in very busy areas, especially when everyone around me was also on their phone.

That is one thing I would not overthink. Full signal bars do not always mean fast internet in big cities. Congestion still happens.

Utah road trip

The Utah section was the real test.

Around towns, hotels, petrol stations, visitor centres, and park entrances, the eSIM did what I needed. I could check routes, messages, load bookings, and look up opening times.

Inside national parks, I would not rely on any mobile plan. Signal dropped on trails and scenic roads, which is normal. Before heading into the parks, I downloaded offline Google Maps, saved hotel details, and made sure I had screenshots of anything important.

That was the right move. The eSIM helped me before and after the parks, but offline maps were still necessary inside them.

Drive days

Long drives (like the Pacific Coast Highway route we drove) are where I appreciated having data the most, but also where I noticed the limits.

On some stretches, the phone had signal. On others, it faded or disappeared for a while. I did not panic because the route was already downloaded, but I was glad when the phone picked up signal again near towns or main roads.

My rule after this trip is simple: download the full route before leaving the city, not just the destination.

Los Angeles

Los Angeles was similar to New York in one way: mobile data was mostly fine, but busy areas could slow things down.

I used it for rideshare apps, maps, food places, hotel details, and checking timings. Nothing dramatic happened, which is honestly what I want from travel data.

What did not work perfectly:

The eSIM was useful, but it did not magically fix US coverage gaps.

National parks still had weak or no signal once I moved away from visitor centres and towns. Some road sections had no useful data for a while. Crowded city areas sometimes felt slower than the signal bars suggested.

That is not really an Ohayu-specific issue. It is just how mobile coverage works in the USA, especially if your trip includes both major cities and open landscapes.

The important part is knowing this before the trip. I would not arrive in Utah and expect constant signal through every canyon, trail, or park road.

How much data I really needed:

I expected maps to use a lot more data than they did.

Google Maps is usually light if you are using normal navigation. The apps that burn data are social media, video, cloud photo backup and video calls.

Here is the rough data guide I used:

Activity	Approximate data use
Google Maps navigation	3-5MB per hour
Google Maps with traffic refreshes	7-10MB per hour
Spotify standard quality	40-70MB per hour
Instagram scrolling	100-200MB per hour
WhatsApp voice call	200-700MB per hour
TikTok	Around 840MB per hour
Zoom or FaceTime video	300MB-1GB per hour

For me, navigation was not the issue. Uploading photos, scrolling videos and letting apps refresh in the background were the things to watch.

Before the flight, I turned off automatic photo backup on mobile data. I also downloaded maps on Wi-Fi whenever I could. That made the plan last much longer than I expected.

Fixed data or unlimited data?

I went with fixed data rather than an unlimited travel plan.

That might sound strange, but I prefer knowing what I actually have. A lot of unlimited eSIM plans have fair-use limits, and after that, the speed can drop. I did not want to discover that halfway through a long drive.

With fixed data, I could see what I was using. If I needed more, I could top up instead of installing a new plan.

For a short city break, I would choose a smaller plan. For a road trip with national parks, long drives, rideshares, and hotel changes, I would rather have more data than I think I need.

What I liked about using Ohayu in the USA

The main thing I liked was that I did not have to change my setup during the trip.

I installed the eSIM once, used it as my data line, and kept my normal number active. That was enough for my route.

Ohayu’s USA eSIM is data-only, so it does not give you a local US phone number. That was fine for me because WhatsApp, iMessage, and email covered most things. For hotel desks or car rental calls, I still had my normal SIM if I needed it.

The other useful part was top-up. I did not want to buy a second plan or go through setup again if I used more data than expected.

What I would check before buying any USA eSIM

After this trip, these are the things I would check before buying an eSIM for the USA:

• Network access.
• Hotspot support.
• Top-up option.
• Whether it includes a local number.
• When the plan activates.
• Whether your phone supports eSIM.
• Whether support is available if activation fails.

The local number point is easy to miss. Most travel eSIMs are data-only. That is usually fine, but it matters if you need to call hotels, restaurants, car rental offices or local services.

Common problems and how I avoided them

The eSIM does not connect after landing

First, check that mobile data is assigned to the eSIM, not your home SIM.

Then toggle airplane mode on and off. If that does not work, restart the phone. Also check that the eSIM is turned on in settings.

The home SIM starts charging roaming

Turn off data roaming on the home SIM before flying.

Keeping the SIM active for calls and texts is fine, but you do not want it using mobile data in the background.

There is no signal in a national park

Download offline maps before entering the park.

Do not wait until you are already at the trailhead. In my experience, signal was usually better near towns, entrances and visitor centres than inside the parks.

Data disappears faster than expected

Check photo backup, app updates, social media autoplay and cloud sync.

Maps were not the problem for me. Background apps were.

Is an eSIM worth it for a USA trip?

For this trip, yes.

The eSIM made the boring travel moments easier: landing, finding the hotel, checking routes, ordering rides, messaging, and moving between places without looking for a SIM card shop.

It did not give me perfect signal everywhere. No mobile plan would have done that on a national parks trip. But it gave me enough data in the places where I needed it, and I liked not having to swap SIM cards or change plans halfway through.

For a two-day city break, roaming might be simpler if your home provider is cheap. For a three-week USA trip with cities, driving, and national parks, I would use an eSIM again.

Last Updated on May 22, 2026 by snaphappytravel