Install and activate are two stages. Installing copies the profile to your phone; activating connects it to a network and starts the clock on validity.
Definitional
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Independent · Guide · Last reviewed 01 Jun 2026 · Methodology v1
How to install and activate an eSIM
How Simscanner stays brand-neutral
General process, not brand steps
Direct answer
Installing an eSIM writes the carrier profile onto your phone; activating it registers that profile on a live network so data flows. You usually install over Wi-Fi by scanning a QR code or entering details manually, then turn on data and, for travel profiles, data roaming once you arrive.
This guide describes the generic flow that applies across brands. Exact menu labels differ by phone, so always follow the steps your provider sends.
The essentials
Key facts
Six facts that hold across brands and phones. Device-support notes are framed as general guidance, because eSIM availability changes by model and region. When in doubt, check your own device before you buy.
You almost always need Wi-Fi or a working mobile connection to install, because the profile is downloaded from the provider over the internet.
Process
No source needed
A QR code and a manual entry both deliver the same profile. Manual entry uses an SM-DP+ address and an activation code instead of a camera scan.
Process
No source needed
As general knowledge, iPhone XS and later and many recent Android phones support eSIM, but availability varies by model and region. Check your device first.
Device support
Per deviceConfirm in your phone settings; figures pending verification
A travel profile only carries data abroad once data roaming is switched on for that specific line, separate from your home line.
Process
No source needed
A QR code is single use on most plans. Scanning it twice can fail or consume the install, so keep it and the manual codes safe.
Per provider
Per providerRe-install rules vary by brand; pending verification
The distinction that confuses people
Install or activate, what is the difference?
These two words are often used as if they mean the same thing. They do not, and mixing them up is the single most common reason a traveller thinks their eSIM is broken when it is simply not connected yet.
Stage one
Install
Installing writes the carrier profile (the eSIM) into the secure chip on your phone. After installing you will see a new line listed in your settings, often labelled with the plan or country. Nothing has connected to a network yet, and on most plans no validity clock has started. Installing is safe to do at home, on your own Wi-Fi, days before you travel.
Stage two
Activate
Activating happens when that installed line first registers on a live network and begins carrying data. On many travel plans the validity period starts at activation or at first network connection, not at purchase. That is why providers often tell you to install in advance but only turn the line on, and switch on data roaming, once you land in the destination country.
The journey at a glance
The activation flow, end to end
Five stages take you from a fresh QR code to working data abroad. The diagram below is the generic path; the exact wording of each toggle differs by phone, but the order rarely does.
The generic procedure
Step by step, in plain language
This is the brand-neutral sequence. Wherever your provider sends specific instructions, follow those; the labels below describe what each step does rather than the exact menu wording on your phone.
1
Confirm your phone takes an eSIM and is unlocked
Open your phone settings and look for an option to add a mobile or cellular plan. As general knowledge, iPhone XS and later and many recent Android handsets support eSIM, but availability varies by model and region, so check your own device. The phone must also be carrier-unlocked. If you are choosing a plan, our guide to choosing a travel eSIM covers what to look for.
Before you buy
2
Connect to Wi-Fi, then start the install
The profile downloads over the internet, so join a reliable Wi-Fi network first. Choose to add a new mobile plan, then pick either to scan a QR code or to enter the details by hand. Doing this at home, before the trip, means you are not hunting for a signal in an unfamiliar airport.
Needs internet
3
Scan the QR code or enter the codes manually
Point the camera at the QR code your provider sent, or type the SM-DP+ address and activation code from the same email if a camera scan is awkward. Both routes install the same profile. Wait for the phone to confirm the plan has been added before moving on.
Install
4
Label the line and set its roles
Give the new line a clear name, such as the destination country, so you can tell it apart from your home number. Your phone will ask which line handles calls, messages, and mobile data. For a travel data plan, set it as the line for mobile data and keep your home line for calls if you wish.
Set roles
5
On arrival, switch the line on and turn on data roaming
Once you land, select the travel line for mobile data and switch on data roaming for that line specifically. Roaming here simply tells the phone the data is allowed to run on a partner network abroad; it does not mean expensive home-carrier charges. A short wait or a restart usually lets the line register and bring up data. To understand which carrier you actually connect to, see how eSIM local networks work.
Activate on arrivalQR code or manual entry, which should I use?
Use the QR code when you can, because it carries the connection details for you and removes the chance of a typo. The catch is obvious once you hit it: you cannot scan a code that is displayed on the same phone you are installing onto. That is why manual entry exists. The provider email also includes an SM-DP+ address and an activation code, and typing those into the manual option installs exactly the same profile. Manual entry is the route to use when the QR is on the screen you are working from, when a printout is smeared, or when a camera will not focus. Keep both the QR image and the text codes until the eSIM is working, since on most plans the code is single use and re-installing later may not be possible.
Is the flow different on iPhone and Android?
The shape of the flow is the same on both: install over Wi-Fi, label the line, choose which line carries data, then enable data roaming on arrival. What differs is the wording and the location of the toggles. On iPhone you generally add a plan through the cellular or mobile data settings and manage which line is the default for data there. On Android the labels and the depth of the menus vary by manufacturer, because each maker skins the settings differently, so the same toggle may sit under a slightly different name. This is exactly why a brand-neutral guide describes what each step achieves rather than promising a fixed tap path. Follow the screenshots your provider supplies for your specific phone, and treat the five stages above as the map.
When should I install, before or on arrival?
Install before you travel, activate on arrival. Doing the download at home, on trusted Wi-Fi, removes the worst failure case: landing in a country with no signal, no roaming, and no way to fetch the profile. The reason you do not switch the line fully on until you arrive is timing. Many travel plans start their validity clock at activation or at first network connection rather than at purchase, so turning the line on early can quietly burn a day of a short plan. The safe pattern is to install and label days ahead, leave the line switched off or set to no data, and only enable the travel line and data roaming once you are on the ground. A handful of providers tie activation to the install step instead, so read the wording your provider sends; where a brand-specific rule would go, treat it as pending verification until you have confirmed it.
Why do I have to turn on data roaming?
A travel eSIM does not use your home network; it connects to a partner carrier in the country you are visiting. To your phone, running data on another operator's network counts as roaming, so the data roaming switch has to be on for that line or no data will flow. The fear most travellers have is that roaming means a surprise bill, but that risk belongs to your home SIM, not the travel eSIM. Enable data roaming only on the travel line, and keep your home line set to no mobile data while abroad. With the travel line carrying data and your home line muted, you get connectivity from the local network without touching your home plan. If data still will not appear after a few minutes, a restart or manually reselecting the network usually nudges the line to register.
Where installs go wrong
Common pitfalls, and how to avoid them
Most failed activations are not faulty eSIMs. They are one of a small set of avoidable mistakes. Recognising them turns a panicked airport moment into a thirty-second fix.
Scanning the QR code twice
On most plans the QR is single use. A second scan can fail or be rejected, and on some providers it consumes the install. If the line did not appear, check your list of mobile plans before re-scanning; it may already be installed under a name you did not expect.
No Wi-Fi to install
The profile downloads over the internet, so an install needs a connection. Trying to install for the first time in a country where you have no signal and no roaming is the classic trap. Install at home over Wi-Fi instead, well before departure.
Data roaming left off
The line installs and even shows bars, but no data loads. Almost always this is data roaming switched off on the travel line. Turn it on for that line specifically, not for your home line, and the data should appear.
Wrong line set for data, or APN issues
If the home line is still the default for mobile data, the travel plan carries nothing. Set the travel line as the data line. A few providers also ask you to add an APN by hand; follow the exact label and APN your provider sends, and do not guess one.
Why this guide names no winning brand
Installation steps are not a ranking, so this page describes the generic process rather than promoting a provider. The brand-specific details (whether a QR can be re-issued, when validity starts, whether an APN is required) belong on each brand profile once read from a primary source and dated. How Simscanner gathers and verifies that information, and why no brand can pay to rank higher, is set out in our methodology and our zero paid placements policy.
Common questions
Common questions about eSIM activation
What is the difference between installing and activating an eSIM?
Installing writes the carrier profile onto your phone, so a new line appears in your settings. Activating happens when that line first registers on a live network and carries data. On many travel plans the validity period starts at activation, which is why providers tell you to install at home but turn the line on once you arrive.
Should I use the QR code or manual entry?
Use the QR code when you can, because it carries the details for you and avoids typos. Use manual entry when the code is displayed on the same phone you are installing onto, or when a camera will not focus. Manual entry uses the SM-DP+ address and activation code from the same email and installs the identical profile.
Do I need Wi-Fi to install an eSIM?
In practice, yes. The profile is downloaded from your provider over the internet, so you need Wi-Fi or an existing mobile connection to install. This is why you should install at home before you travel, rather than after landing somewhere with no signal and no roaming. Activation itself then happens over the local network on arrival.
Should I install the eSIM before or after I arrive?
Install before you travel and activate on arrival. Installing at home over Wi-Fi avoids being stranded without a signal. You hold off on fully switching the line on because many travel plans start their validity at activation, so turning it on early can waste a day. Always follow the timing your provider states for your specific plan.
Why is there no data after I installed the eSIM?
The most common cause is data roaming left switched off on the travel line, since the eSIM connects through a partner carrier abroad. Check that data roaming is on for that line specifically and that the travel line is set as the line for mobile data. A restart or manually reselecting the network often helps the line register.