The short answer: installing needs a connection, so prepare before you go
Here's the bottom line: installing an eSIM (downloading the profile) requires an internet connection. That means trying to install one from scratch after you land, with no connectivity at all, can leave you stuck. The smoother approach is to finish the install before you leave — over your home or hotel Wi-Fi — and then simply activate the line once you arrive. This way you don't have to hunt for Wi-Fi on the ground, and you can start using data soon after touchdown.
"Install" and "activate" are two different steps. Keeping them separate in your mind helps you stay calm when you arrive. In this article we'll explain why installation needs a connection, walk through a low-stress preparation routine, and cover what to do if a QR code won't scan — all written for first-timers. For the full picture of setting up an eSIM abroad, see our complete eSIM setup guide as well.
Why does installing an eSIM need an internet connection?
Instead of slotting in a physical SIM card, an eSIM works by downloading a piece of data called an "eSIM profile" into your phone. The step that loads this profile onto your device is the "install," and because it's a download, it needs some form of internet connection — Wi-Fi or mobile data.
Even with the QR-code method, the QR is just a doorway that tells your phone where to fetch the profile from. After you scan it, your device still has to receive the actual profile from a server, so that transfer won't complete without a connection. In other words, scanning the QR isn't the whole job — the download that happens after the scan is what requires connectivity.
How are "install" and "activate" different?
These two are easy to mix up, so let's lay them out side by side.
| Step | What it does | Internet needed? | Best timing |
|---|---|---|---|
| Install | Load the eSIM profile onto your device (scan QR, enter a code, etc.) | Yes | Before you travel (e.g. home Wi-Fi) |
| Activate | Turn on the installed line and start using it at your destination | Usually no (just a settings toggle) | After you arrive |
With many plans, you install ahead of time wherever you have a connection, then just switch the line on in your settings once you land. That said, the activation timing and steps can vary from plan to plan. Whether your days of use are counted "from activation" or "from install" can also differ by product, so please check the details before you buy (as of June 2026).
The safest routine: install before departure, activate on arrival
The flow least likely to trip you up is this:
- Before you leave, install the eSIM somewhere with Wi-Fi, such as at home
- Once you arrive, turn the eSIM line on (activate) in your settings
- If needed, check your data roaming or APN settings
This approach lowers the risk of scrambling for shaky Wi-Fi at your destination or struggling to download over a crowded airport network. For a step-by-step look at the actual screens, see how to set up an eSIM. Before you install, it's also worth confirming your device supports eSIM on our eSIM-compatible devices page for extra peace of mind.
Because activation timing depends on the plan, if you're wondering whether installing early eats into your days of use, check the details on the product page before you purchase.
What to do if there's no Wi-Fi or the QR won't scan on arrival
Sometimes you forget to install before leaving, or you only have time to do it once you're there. Knowing a few fallbacks for avoiding a no-connection situation can save you stress.
Use free airport or hotel Wi-Fi
Many airports and hotels offer free Wi-Fi. Connecting to it right after you arrive lets you finish the install on the spot. Keep in mind it can be hard to connect when networks are busy or access is restricted, so treat this as a backup option and, ideally, install before you depart.
If the QR won't scan, enter the code manually (activation code)
Even when a QR code won't scan properly, most devices offer a manual code-entry option. You can type the information contained in the QR (such as the activation code) directly into your settings to install. Along with the QR image, it helps to keep a copy of the code as a screenshot or note, so you have a fallback if scanning fails on the ground.
Borrow a connection from another device or a travel companion
You can also connect temporarily through a travel companion's phone hotspot or another means of getting online, and install during that window. Once the install is done, you just activate your own eSIM line and you're ready to go.
Pre-departure preparation checklist
To avoid a scramble at your destination, check these points before you leave.
- Whether your device supports eSIM (check compatible devices)
- Whether you've completed the install over Wi-Fi, e.g. at home
- Whether you've saved the QR code and the manual-entry code (screenshot or note)
- Whether you've confirmed the activation timing in the plan details
- Whether you know how to set data roaming and APN (setup guide)
- Whether you've reviewed what to do if things don't work (connection troubleshooting)
If this is your first time, skimming our eSIM setup guide once for the overall flow makes it easier to avoid missing a step.
What to know before using a data-only eSIM
Bloomy plans are generally data-only. Once installed and activated you can use the internet, but voice calls over a phone number and receiving SMS sent to a number are generally not included. If you need a phone number or SMS-based verification, it's worth also looking into other options such as a local SIM or a plan that includes a number. Note that app-based calls through services like WhatsApp may work wherever you have a data connection.
Data allowance, supported countries, and length of use vary by plan and are subject to change. Keep in mind that actual connection quality can vary depending on the local network, your device, and your location. To find a plan that fits where you're headed, use our eSIM comparison page to check by country, data amount, and number of days (please refer to the latest listings). All plans are subject to a fair-use policy.
In summary: install first, activate on arrival
Installing an eSIM requires a connection. That's exactly why it's safest to finish the install before departure, where you reliably have internet, and leave only the activation for your destination. Knowing your fallbacks — manual code entry when a QR won't scan, and airport Wi-Fi as a backup — cuts down even further on situations where you'd be stuck on the ground. For the specific setup steps, follow the setup guide, and if something isn't working, check the connection troubleshooting page as you go.
You'll find more articles on this topic in our related articles list.
