How to Use an eSIM: A Simple Guide for iPhone and Other Devices

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 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
• What 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.

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 eSIM in minutes and connect to mobile internet in over 50 countries.

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

Check if Your Device Supports eSIM

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

Choose a Provider

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

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.

Activate the eSIM

Scan the QR code in your device settings, and your eSIM will be ready within minutes. No reboot needed — you’re instantly connected.

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

Here’s your quick-start guide:

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

Done! Your eSIM is live, and you can start using mobile internet immediately.

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

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

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
• Nothing Phone (1), (2)
• Many newer Android tablets and laptops

You’re now connected via eSIM!

Most eSIM providers offer full-service plans with voice and SMS. But what if you only want mobile data — for work, navigation, social media, or video calls while abroad?

That’s where RedDogFish comes in.

RedDogFish eSIMs are designed for:

• Travelers who need internet when they land
• Remote workers who need reliable data abroad
• Motorola Razr 5G, some Sony Xperia models
• Nothing Phone (1), (2)
• Anyone who wants a second internet connection without switching SIMs

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

• 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 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 eSIM on a new phone. Just reach out to our support team.

• 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.

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

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