What is an eSIM? A Simple Guide for Travellers

If you have travelled overseas in the past, you have probably dealt with at least one of these headaches: expensive roaming charges, hunting for a local SIM card after landing, or juggling tiny bits of plastic while trying not to lose your main SIM (I have lost mine before and it just adds so much stress to what it supposed to be a fun trip).

An eSIM is designed to remove most of that friction. But despite the name, it does not need to feel technical or complicated.

This guide explains what an eSIM is, how it works, and whether it is a good option for your next trip, using plain language and real travel examples.

Table of Contents

• What is an eSIM?

• How is an eSIM different from a normal SIM?

• How does an eSIM work when you travel?

• Do I need to be good with technology to use an eSIM?

• What can I use an eSIM for?

• What types of eSIM plans are available?

• Are eSIMs better than roaming?

• Are there any downsides to eSIMs?

• Who should consider using an eSIM?

What is an eSIM?

Simply put, an eSIM is a digital SIM card built into your phone.

Instead of inserting a physical SIM card, you download your mobile plan directly onto your device. Once it is installed, your phone connects to local mobile networks in the country you are visiting, just like a normal SIM would.

There is no plastic card, no swapping trays, and no waiting in line at the airport.

If your phone supports eSIMs, everything is handled through your phone’s settings.

How is an eSIM different from a normal SIM?

A traditional SIM card:

• Is a small physical card
  

• Needs to be inserted into your phone
  

• Often needs to be removed and replaced when travelling
  
  

An eSIM:

• Is built into your phone
  

• Is downloaded digitally
  

• Can be installed before you leave home or after you arrive
  

• Can be turned on or off without removing anything
  

Many newer phones allow you to use both a physical SIM and an eSIM at the same time. This means you can keep your regular number active for calls or texts, while using the eSIM for mobile data overseas.

How does an eSIM work when you travel?

The process is pretty simple:

1. You choose an eSIM plan for the country or region you are travelling to
   

2. You receive a QR code or activation link
   

3. You scan or install it on your phone
   

4. When you arrive, you turn the eSIM on and connect to a local network
   

Once activated, your phone uses local mobile networks in that destination, giving you access to mobile data for maps, messaging, browsing, and apps.

There is no need to visit a store or speak to a mobile provider in another language.

Do I need to be good with technology to use an eSIM?

Not at all. We want eSIM technology to be accessible to everyone.

If you are comfortable using basic phone settings, you can use an eSIM. The setup process usually takes just a few minutes and only needs to be done once.

For many travellers, it is actually simpler than dealing with physical SIM cards or international roaming.

What can I use an eSIM for?

An eSIM gives you mobile data while travelling, which is useful for:

• Maps and navigation
  

• Messaging apps like WhatsApp or Messenger
  

• Booking transport or accommodation
  

• Looking up attractions and opening hours
  

• Staying in touch with family back home
  

• Sharing photos or updates while travelling
  

Most travellers use eSIMs mainly for data rather than calls, but internet-based calling and messaging work exactly the same as they do at home.

What types of eSIM plans are available?

Most travel eSIMs fall into two main categories.

Fixed data plans

These give you a set amount of data, such as 5GB or 10GB, to use over a specific period.

They are ideal if you:

• Mainly use maps and messaging
  

• Spend a lot of time on Wi-Fi
  

• Want a lower-cost option
  

Unlimited data plans

These allow you to use as much data as you need during the plan period, subject to fair usage policies.

They are better suited to:

• Frequent travellers
  

• People working remotely
  

• Streaming, video calls, or heavy app use
  

• Not wanting to worry about data limits

Providers like Pocket Roam offer both fixed-data and unlimited eSIM plans, letting travellers choose based on how they actually use their phones rather than locking them into a single approach.

Are eSIMs better than roaming?

For most travellers, yes.

International roaming through your home mobile provider can be convenient, but it is often expensive and can come with speed or usage limits.

An eSIM:

• Usually costs less than roaming
  

• Connects directly to local networks
  

• Can be set up before you travel
  

• Avoids bill shock when you return home

Are there any downsides to eSIMs?

There are a few things to keep in mind:

• Your phone must support eSIMs (most newer phones do)
  

• Setup requires an internet connection
  

• Some plans are data-only and do not include a phone number
  

For most travellers, these are minor trade-offs compared to the convenience.

Unsure whether your phone is eSIM-compatible? Check out our guide to eSIM compatibility here or our list of compatible devices.

Who should consider using an eSIM?

An eSIM is a good option if you:

• Travel overseas regularly
  

• Want to avoid roaming fees
  

• Prefer setting things up before you leave
  

• Don’t want to swap physical SIM cards
  

• Want flexible data options for different trips
  

It is especially useful for international trips where reliable mobile data makes travel easier and less stressful.

Final thoughts

An eSIM is simply a modern, more convenient way to stay connected while travelling. It removes many of the small frustrations that come with international trips and makes managing mobile data far easier.

If you’re planning an upcoming trip, exploring travel eSIM options ahead of time can make arrival day much smoother. Providers such as Pocket Roam allow you to choose a plan that suits your destination and travel style before you even leave home. Explore all of our data bundles here, or reachout via our live chat, and we can help you find the best solution for your trip.