eSIM for Spaniards Traveling to the USA — Practical Guide 2026

If you're traveling from Spain to the United States, you already know that roaming with your local operator can be a very unpleasant surprise when you return: bills of tens or even hundreds of dollars/euros for just a few days of data. There's a much smarter solution: a dedicated eSIM for the United States.

In this guide, we'll explain exactly how it works, how much you can save compared to roaming with your Spanish operator, and how to activate your PuraSim eSIM before boarding your flight.

With PuraSim, you get local data in the United States from the moment you land, at local prices, with no commitments and without changing your physical SIM.

Roaming from Spain to the United States: what it really costs

Spanish operators offer international roaming packages for the United States, but the prices are rarely competitive. Depending on your operator, a day of data in the United States can cost you between 15-25 USD/EUR per day.

Let's look at a real example: if your trip to the United States lasts 10 days and you use data moderately (maps, messages, social media), with traditional roaming you could pay between 150 and 250 euros/dollars just for connectivity. With a PuraSim eSIM for the United States, the same usage would cost a fraction.

In addition to the cost, roaming has other limitations:

• Reduced speed often to 3G or even 2G
• Very low daily data cap before your speed is cut off
• You need to activate the service before you leave (and pay for it even if you don't use it)

A PuraSim eSIM eliminates all these problems: you pay once for the GB you need, you get real 4G/5G speed, and you activate it only when you need it.

How an eSIM for the United States works

An eSIM (embedded SIM) is a digital SIM that lives inside your phone. There's no physical card to insert: you download the operator's profile using a QR code, and you're good to go. Your phone can have several eSIMs installed simultaneously and switch between them in seconds.

For travelers from Spain to the United States, the process is as follows:

1. You buy your data plan on purasim.com before you leave
2. You receive the QR code by email
3. You install the eSIM on your phone from home (in 5 minutes)
4. Upon landing in the United States, you activate the eSIM and you already have local data
5. Your Spanish SIM still works for receiving calls and SMS

No need to go to any store. No need to queue. No need to look for a phone shop when you arrive at the US airport. You arrive and you already have working internet.

How many GB do you need for the United States?

For a trip from Spain to the United States, our recommendation is 15-20 GB for 10 days. This is enough for most common uses: Google Maps all day, WhatsApp with family and friends in Spain, Instagram, occasional searches, and an occasional video call.

Typical daily consumption breakdown:

• Google Maps actively navigating: ~150 MB/day
• WhatsApp with messages and photos: ~100 MB/day
• Instagram and social media (no video): ~300 MB/day
• Searches and websites: ~100 MB/day
• Estimated total: 600-700 MB/day for moderate use

If you're going to work remotely, make frequent video calls, or upload real-time content, consider a higher plan. PuraSim plans have top-up available if you run out, so you can always extend.

Tip: Iberia and Air Europa operate direct flights from Madrid to New York and Madrid to Miami; with an active ESTA/Visa, activate the eSIM before check-in

How to activate the eSIM before your flight

The best thing about PuraSim eSIMs is that you can have it ready before leaving Spain. The installation process takes about 5 minutes and you only need WiFi:

1. Check compatibility: make sure your phone supports eSIM (iPhone XS or higher, Samsung Galaxy S20+, Google Pixel 3+ and many more).
2. Buy your plan on purasim.com. Select the United States destination and the GB plan you need.
3. Install the eSIM: open the email with the QR code and go to your phone's Settings to scan the code and download the profile.
4. Configure the eSIM: give it a recognizable name (e.g. "PuraSim United States") and make sure it is configured for data but NOT for calls or SMS (keep those on your Spanish SIM).
5. Activate it upon arrival: on the plane, you can have the eSIM installed but inactive. Upon landing in the United States, go to Settings → Mobile Data and activate the PuraSim eSIM.

In less than 5 minutes after landing, you'll have full data in the United States without having left the airport.

Tips for travelers from Spain to the United States

Beyond connectivity, here are some specific tips for travelers from Spain:

• Download everything before you leave: offline maps of New York, Miami, Las Vegas, and Los Angeles on Google Maps, playlists on Spotify, Netflix episodes for the flight. In the first few hours of your flight, you won't have data.
• Notify your bank: many Spanish banks block transactions in the United States for security. Inform them of your trip to avoid your card being blocked at the worst possible moment.
• WhatsApp will work perfectly: with the eSIM active, you can call and chat with family and friends in Spain without additional international call costs.
• Save documents offline: scan your passport, travel insurance, and bookings and save them on your mobile. If there's a moment without data, you'll still have access.

And remember: Iberia and Air Europa operate direct flights from Madrid to New York and Madrid to Miami; with an active ESTA/Visa, activate the eSIM before check-in

With PuraSim connected, your trip from Spain to the United States starts smoothly from the very first moment.

Frequently asked questions

Escrito por Marc González Sáez Fundador de PuraSim y especialista en eSIM y conectividad para viajeros. Lleva años ayudando a viajar conectado por todo el mundo sin pagar de más por el roaming, y prueba personalmente las eSIM en cada destino antes de recomendarlas.