Cómo usar una eSIM: una guía sencilla para iPhone y otros dispositivos

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4 September 2025

5 min de lectura

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  • Cómo usar una eSIM: una guía sencilla para iPhone y otros dispositivos
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Travel eSIM: How to Use It in 2025 And Why You’ll Love It

So, you’ve heard about eSIM technology, or maybe even purchased one, but now you’re wondering:

  • How do you actually use an eSIM?

  • What’s the difference between an eSIM and a regular SIM card?

  • And how to use eSIM in iPhone or other phones?

You’re not alone. As travel eSIM adoption grows worldwide, more users are asking these questions. In this guide, we’ll explain:

  • How to use an eSIM step-by-step

  • How to use an eSIM on iPhone

  • Which phones support eSIM

  • How to use an eSIM card specifically for mobile internet only

  • Why RedDogFish is a top choice for fast eSIM data

Let’s dive in.

What Is an eSIM, and How Do You Use It?

eSIM stands for “embedded SIM.” Unlike a physical SIM card, an eSIM is a small chip that’s built into your phone or tablet. It performs the same function — giving your device access to mobile networks — but without the need to insert or remove anything.

So, how do you use an eSIM card?

By scanning a QR code or using an activation code from your eSIM provider. The entire process is digital, instant, and wireless.

No shipping delays. No plastic cards. No visits to a store.

If you’re using RedDogFish, you can get your travel eSIM in minutes and connect to mobile internet in over 190 countries.

How to Use an eSIM: General Steps for Any Device

Here’s a universal step-by-step guide to help you understand how to use an eSIM card on modern smartphones and tablets:

1. Check if Your Device Supports eSIM

Before using an eSIM, make sure your device is compatible. Wondering which phones can use an eSIM? See below — we’ve got a full list.

2. Choose a Provider

To use an eSIM, you’ll need to purchase a data plan. RedDogFish offers prepaid mobile internet eSIMs — no contracts, just reliable, fast data.

3. Receive Your eSIM

Once you purchase your eSIM, you’ll receive a QR code or activation details via email. This allows you to install your eSIM profile onto your device.

4. Activate the eSIM

Tap or scan the QR code with your device and your travel eSIM will be ready within minutes. No reboot needed — you’re instantly connected.

How to Use an eSIM on iPhone

A huge portion of eSIM users ask: how to use eSIM on iPhone?

Here’s your quick-start guide:

  1. Buy online at RedDog.fish

  2. Receive a QR code instantly

  3. Tap or scan the QR code

  4. Turn on eSIM

  5. Done! You’re connected.

Now your travel eSIM is live, and you can start using mobile internet immediately. If you still have questions, please visit our installation guide.

Tip: You can use your RedDogFish eSIM for data, and keep your primary SIM active for calls.]

Compatible iPhones:

Most iPhones from the iPhone XR/XS onward support eSIM. That includes:

  • iPhone XR, XS, XS Max

  • iPhone 11, 12, 13, 14, and 15 series

  • iPhone SE (2nd and 3rd Gen)

  • All iPhones sold in the U.S. since iPhone 14 are eSIM-only

How to Use an eSIM on Android

On Android, using an eSIM depends slightly on the manufacturer, but the process is similar:

  1. Purchase at RedDog.fish

  2. Get your QR code instantly

  3. Tap or scan QR to install

  4. Activate eSIM

And you’re now connected via travel eSIM! If you still have questions, please visit our installation guide.

Phones That Support eSIM:

  • Google Pixel 3 and newer

  • Samsung Galaxy S20 and newer, Z Fold, Z Flip

  • Motorola Razr 5G, some Sony Xperia models

  • Many newer Android tablets and laptops

Using an eSIM for Mobile Internet

RedDogFish travel eSIMs are designed for:

  • Travelers who need internet when they land

  • Remote workers who need reliable data abroad

  • Anyone who wants a second internet connection without switching SIMs

No phone number. No complicated settings. Just fast, flexible internet.

How to use a RedDogFish travel eSIM:

  1. Pay securely online

  2. Receive your eSIM via email instantly

  3. Tap or scan and connect!

Common Questions About Using a Travel eSIM

Q: How do you use an eSIM if you already have a physical SIM card installed? A: You can use both at the same time! Just choose which SIM is used for data, calls, or texts in your settings.

Q: Can I switch eSIMs between devices? A: eSIMs are generally locked to one device. If you change phones, you may need to get a new QR code or reinstall. RedDogFish allows reinstallation — just contact our support.

Q: How do I turn off or remove an eSIM? A: Go to your mobile settings, select the eSIM, and tap Delete or Remove Cellular Plan.

Q: What if I lose my phone with the eSIM? A: With RedDogFish, we can help you reinstall your travel eSIM on a new phone. Just reach out to our support team.

Summary: How to Use a Travel eSIM in 2025

  1. Check device compatibility

  2. Purchase a plan and get the QR code

  3. Tap or scan the QR

  4. Start using mobile internet instantly

Why Use a Travel eSIM from RedDogFish?

  • Works in 190+ countries

  • Instant setup via QR code

  • No contract, no hidden fees

  • Perfect for short trips, long stays, or mobile work

Whether you're wondering how to use an eSIM card or how to use an eSIM in your iPhone, the process is simple — and RedDogFish makes it even easier.

Ready to Use Your eSIM?

Getting started is fast, easy, and reliable with RedDogFish.

Buy your travel eSIM today and get mobile internet anywhere in minutes!

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