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When to install and when to activate your eSIM: getting the timing right
Installing and activating aren't the same thing, and confusing them costs days of your plan. What to do at home, what to leave for arrival, and what to check first.
Dani Requena 7 min Photo by Ross Sneddon on Unsplash This is the question that comes up most in the days before a trip, and it comes from mixing up two different things. Installing means putting the profile on your phone. Activating means the plan starting to count. Days can pass between the two, and getting it right is what stops you losing part of what you paid for.
Installing: at home, on wifi, unhurried
Installing the profile needs a connection, because your phone has to download it from the operator's server. That's why you do it at home and not at the boarding gate, where airport wifi is what it is and time is short.
- Check your phone supports eSIM and is carrier unlocked.
- Install the profile on wifi, following the link or code you received.
- Give the line a name you'll recognise, like Travel.
- Leave it SWITCHED OFF until you need it, if the plan allows that.
The right day to do it is one or two before you leave. Enough margin to ask if something goes wrong, and not so early that you forget you have it.
Activating: it depends on the plan, and this matters
Here's the part no guide can settle in general terms. Some plans start counting the moment they're installed, and others start when your phone first connects to a network at your destination.
It isn't the same in every country, nor across every plan within one country, so any absolute statement about this is wrong half the time. What to do instead is check your destination's page, which says which it is in the installation step, with the wording its own catalogue calls for.
| If the plan starts | What to do |
|---|---|
| When you connect at your destination | Install at home and activate on arrival, no rush |
| When you install it | Install close to departure, not weeks ahead |
What to do when you land
- Come out of aeroplane mode with data roaming already off on your everyday line.
- Go into your settings and switch the eSIM's line on if you'd left it off.
- Set it as your data line and check its roaming is on.
- Give it a minute to register on a network. If nothing appears, switch aeroplane mode on and off once.
In some destinations you have to pick the network by hand the first time. That's normal and it's in your network selection settings.
The three mistakes that cost days
- Installing weeks ahead a plan that starts counting on install. You lose days of validity before you've left the house.
- Leaving the install for the airport at your destination, where there may be no usable wifi and the profile can't be downloaded without a connection.
- Deleting the profile by mistake, thinking it switches it off. Switching off and deleting are different buttons, and the second one has no undo.
And the installation code, which works once
The code or activation link works a single time: using it assigns the profile to that chip. That's why it's worth keeping the purchase email and not deleting it until you're back, and why changing phone mid-trip isn't a trivial matter.
The full installation steps, with the iPhone and Android paths, are in how to install the eSIM before you travel.
Frequently asked questions
When should I install the eSIM?
At home on wifi, one or two days before you leave. Installing needs a connection, so leaving it for the airport at your destination is risky.
Does installing the eSIM activate it?
It depends on the plan. Some start counting on install and others when you first connect to a network at your destination. Each destination's page says which, in the installation step.
Can I install it weeks in advance?
If the plan starts counting when you connect at your destination, yes. If it starts on install, you'd be losing days of validity before you leave.
What do I do when I land?
Switch the eSIM's line on, set it as your data line and check its roaming is on. If it won't register on a network, switch aeroplane mode on and off once.
Can I use the installation code twice?
No. It's single use, and using it assigns the profile to that phone. Keep the purchase email in case you need support.
