What Is an eSIM? A Simple Guide for Travellers
An eSIM is a SIM that is already inside your phone. Here is how it works, how it compares with a plastic SIM and roaming, and how to get one on WhatsApp.
An eSIM is a SIM built into your phone. You add a mobile plan by scanning a QR code instead of putting a plastic card in a tray. For travel, it lets you get local data in another country without roaming charges, and your normal number stays on your phone.
What an eSIM is
eSIM stands for embedded SIM. It does the same job as the small plastic SIM card in your phone: it connects you to a mobile network. The difference is that it is a chip already built into the phone, so there is nothing to insert or lose.
To add a plan you scan a QR code (or enter a code) and your phone downloads the plan. Most eSIM phones can store several plans and switch between them in settings. You can keep your usual SIM for calls and texts and use an eSIM for data at the same time.
eSIM vs physical SIM
The two work the same once they are on your phone. The difference is how you get and manage them.
| Physical SIM | eSIM | |
|---|---|---|
| Form | Plastic card in a tray | Chip built into the phone |
| How you get it | Posted, or collected at an airport or shop | QR code sent to you, installed in minutes |
| Switching plans | Swap the card | Change in settings, no tools |
| Several plans on one phone | Usually one or two cards | Several eSIM profiles can be stored |
| Lost or damaged | Card can be lost or bent | Nothing to lose, though the profile is tied to the phone |
| Before a trip | Find a shop on arrival | Buy and install before you fly |
How an eSIM works
Choose a plan
Pick the country and the amount of data you need for your trip.
Scan the QR code
Your phone downloads the plan over Wi-Fi. This takes a minute or two.
Switch data on
Select the eSIM for mobile data. It connects to a local network at your destination.
Step-by-step phone instructions are in our activation guide.
Why use an eSIM for travel
- No roaming surprises. You pay a fixed price for a set amount of data instead of daily roaming fees from your home network.
- Keep your number. Your normal SIM stays active, so people can still reach you on your usual number and you can still use WhatsApp, maps and rideshare apps on the eSIM data.
- Sorted before you fly. Install it at home on Wi-Fi and switch it on when you land, with no queue for a local SIM.
- Works across destinations. Plans are available for single countries and regions, so you pick what fits the trip.
eSIM vs roaming vs a local SIM
| Travel eSIM | Home network roaming | Local SIM | |
|---|---|---|---|
| Setup | Install before or during the trip | None, but check your plan first | Find a shop, show ID, wait |
| Cost | Fixed price per plan | Often a daily fee or pay per MB | Usually cheap, but airport prices vary |
| Keep your number | Yes, on your normal SIM | Yes | Only if you have a second SIM slot |
| Best for | Most holidays and short trips | Quick trips where your bundle includes the country | Long stays with local calling |
Roaming rules differ by country and by network, so check what your own provider charges for your destination before you decide.
How GleeSim works
GleeSim is a UK travel eSIM provider. We do it all in WhatsApp, so you do not need to download an eSIM app or create an account.
What you do
- Message us on WhatsApp and say where you are going.
- Choose a plan and pay in the chat. You can buy as a guest.
- Receive your QR code and install guide, usually in under 2 minutes.
- Scan, switch on data, and travel.
What you get
- Plans for 195+ countries
- A real person on WhatsApp 24 hours a day, 7 days a week
- Data and top-ups handled in the same chat
- 10% off with code GLEE10 when you buy on WhatsApp
You can also browse plans and prices on our destination pages or on offers.gleesim.com.
What you need
- A phone or tablet that supports eSIM. See the compatible devices list, or check your phone settings for an "Add eSIM" option.
- A phone that is not locked to one network. If it is locked, ask your provider to unlock it first.
- A Wi-Fi or data connection to download the eSIM.
- WhatsApp, to buy and get your QR code.
Frequently asked questions
What is an eSIM?
Is an eSIM the same as a physical SIM?
Will my phone number still work?
How do I know if my phone supports eSIM?
Do I need an app to use a GleeSim eSIM?
How quickly do I get my eSIM?
Does a GleeSim eSIM include calls and texts?
Can I top up my eSIM?
Can I move an eSIM to a new phone?
Can I buy an eSIM for someone else's phone?
What is the GLEE10 code?
Does a GleeSim eSIM work with the Nusuk app?
Keep reading
Ready to get connected?
Message us on WhatsApp. Pay in the chat and get your QR code, usually in under 2 minutes. Use code GLEE10 for 10% off.
