Yes, you can switch eSIMs while travelling
Yes. If your phone supports multiple eSIMs, you can switch between eSIM plans during a trip without physically changing a SIM card.
The important thing to understand is that switching between eSIMs is not the same as deleting an eSIM.
You can usually keep your old eSIM installed, activate a new one, and choose which eSIM your phone uses for mobile data. Your remaining data on the old plan does not normally transfer to the new provider, and unused data may expire according to the original plan's terms.
For most travellers, the safest approach is:
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Buy your new eSIM.
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Install it while you still have Wi-Fi.
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Keep your existing eSIM installed.
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Select the new eSIM as your mobile data line.
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Turn off data roaming on your home SIM if necessary.
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Test that the new connection works before relying on it.
This makes switching providers or plans much easier than swapping physical SIM cards.
Can You Switch eSIMs While Travelling?
Yes. You can switch eSIMs in the middle of a trip, provided your phone supports eSIM and the relevant plans.
Modern smartphones can store multiple eSIM profiles, although the exact number you can store and use at the same time depends on the device.
For example, Apple says supported iPhones can store eight or more eSIMs and switch between stored plans. Some iPhone models can also have two eSIMs active at the same time.
Google also says compatible Pixel phones can have multiple eSIM profiles and switch between lines or manage international plans while travelling.
That means you don't necessarily have to stick with the first travel eSIM you bought for your entire trip.
You might start with one provider, use most of your data, then install another eSIM for the rest of your journey.
What Happens to Your Data When You Switch eSIMs?
This is probably the biggest question travellers have.
Your data belongs to the plan you purchased.
Switching to another eSIM does not normally transfer your unused data, days or allowance to the new provider.
Think of each eSIM plan as a separate mobile service.
For example:
You buy an eSIM with:
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10GB of data
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30-day validity
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Coverage across Europe
After two weeks, you have 2GB remaining.
You then buy another eSIM because you're travelling somewhere where the second provider offers better coverage.
When you switch to the new eSIM, you haven't moved that remaining 2GB across.
You simply have two separate plans.
The original eSIM may still have 2GB remaining, but your phone is now using the new eSIM for mobile data.
Whether you can return to the original plan later depends on whether it is still valid and supported by the provider.
Switching eSIMs vs Deleting an eSIM
These are two very different things.
Switching eSIMs
This means you keep the eSIM installed on your phone but choose another line for mobile data.
For example:
eSIM A: Your original travel plan
eSIM B: Your new travel plan
You select eSIM B for mobile data.
eSIM A remains stored on your phone.
This is generally the safer option if you think you might need the original plan again.
Deleting an eSIM
Deleting the eSIM removes the profile from your phone.
That's something you should be much more careful about.
If you delete an eSIM that still has usable data or remaining validity, you may not be able to simply reinstall it. Whether an eSIM can be reinstalled depends on the provider and the specific plan.
So if you're changing providers mid-trip:
Don't delete your old eSIM just because you're no longer using it.
Keep it installed unless you know you won't need it again and understand the provider's reinstallation policy.
Why Would You Switch eSIMs During a Trip?
There are several good reasons.
1. You've run out of data
This is probably the most obvious reason.
You started your trip with 5GB but used it faster than expected.
Rather than relying on expensive roaming, you could purchase another travel eSIM with additional data.
This can be particularly useful if you're using your phone for:
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Google Maps
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TikTok and Instagram
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Video calls
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Streaming
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Hotspotting
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Uploading photos and videos
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Work
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Navigation
2. You're travelling to another country
A plan that works well in one country may not be the best option for the next destination.
Imagine a two-week trip:
London → Paris → Rome → Athens
Your first eSIM might cover France and Italy but not Greece.
Instead of buying an entirely new physical SIM when you arrive, you could install a new eSIM that covers the remaining destinations.
Alternatively, a multi-country or regional eSIM could make more sense from the beginning.
Multi-Country eSIM Plans: Buy Once and Stay Connected Across Multiple Countries
3. Your current provider has poor coverage
An eSIM itself doesn't create mobile coverage.
The service depends on the networks and roaming agreements available through the provider.
You might find that your current eSIM works perfectly in one city but gives you weaker service in another location.
If your provider doesn't offer a suitable network option, switching to another eSIM could solve the problem.
4. You found a better plan
Sometimes you simply find a better deal.
Perhaps another provider offers:
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More data
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Longer validity
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Better coverage
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A regional plan
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A cheaper price
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A plan better suited to the rest of your trip
There's no requirement to stay with the first eSIM you bought.
Does Switching eSIMs Delete Your WhatsApp or Apps?
No.
Changing your mobile data eSIM does not delete your apps or the information stored inside them.
Your:
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WhatsApp
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Instagram
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Google Maps
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Gmail
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Photos
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Banking apps
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Contacts
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Browser
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Social media accounts
remain on your phone.
The main thing that changes is which mobile network provides your internet connection.
Your WhatsApp account can continue working with your existing phone number, even if you use a different eSIM for mobile data.
That's one of the reasons travel eSIMs are useful for international trips.
Can You Use WhatsApp With an eSIM Abroad?
What About My Normal Phone Number?
This is where things can get slightly confusing.
Your home SIM and your travel eSIM can often exist on the same phone.
On supported iPhones, for example, you can use a home line alongside a travel eSIM, with the travel eSIM selected for mobile data.
This means you could have:
Home SIM: Your normal UK number
Travel eSIM: Your travel data connection
You don't necessarily have to remove your home SIM.
However, you need to pay attention to your phone's settings.
If your home line is allowed to use mobile data while abroad, you could potentially incur roaming charges depending on your home provider and plan.
Apple specifically recommends checking data roaming settings when travelling internationally.
eSIM vs International Roaming: Which Is Cheaper for Travelling Abroad?
Will I Lose My WhatsApp Number If I Switch eSIMs?
Usually, no.
Your WhatsApp account is associated with your WhatsApp phone number, not simply whichever SIM is currently providing your mobile data.
For example:
You normally use a UK number for WhatsApp.
You travel to Spain and install a Spanish or European travel eSIM.
You can continue using WhatsApp with your existing account while using the travel eSIM for internet access.
You don't need to change your WhatsApp number simply because you're using another data connection.
The important distinction is:
Your phone number and your mobile data connection are not necessarily the same thing.
Can You Use WhatsApp With an eSIM Abroad? (Complete 2026 Guide)
Can You Have Two eSIMs at the Same Time?
On compatible devices, yes.
This can be one of the biggest advantages of eSIM technology for travellers.
For example, you could have:
Line 1: UK SIM
Line 2: Travel eSIM
Or, on supported phones:
Travel eSIM A: Europe plan
Travel eSIM B: Global plan
You then choose which line is used for mobile data.
Apple's current guidance says supported iPhones can use two eSIMs simultaneously, while Google says some Pixel devices can also use two eSIM profiles at once, depending on the device and carrier.
Your exact options depend on your phone model and network provider.
How to Switch to a New eSIM Mid-Trip
The process varies between phones, but the basic idea is the same.
Step 1: Buy your new eSIM
Choose a plan that covers the country or countries you're travelling in.
Check:
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Countries covered
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Data allowance
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Validity period
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Network coverage
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Whether the plan is data-only
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Whether hotspot is supported
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Activation requirements
Don't assume every eSIM works in every destination.
Step 2: Install it while you have Wi-Fi
This is one of the most important tips.
If your current eSIM is still working, use it or connect to Wi-Fi before installing the replacement.
That gives you a backup connection if something goes wrong during setup.
You don't want to be standing outside an airport trying to install an eSIM with no internet connection.
Step 3: Keep your old eSIM installed
Unless you have a specific reason to remove it, leave the old profile on your phone.
This gives you the option to switch back if necessary.
It also avoids accidentally deleting a plan that could still be useful.
Step 4: Select the new eSIM for mobile data
On iPhone, you can choose which line is used for mobile data through the Mobile Data settings.
On compatible Pixel devices, SIM settings are managed under Settings > Network & internet > SIMs.
The exact menu names can vary by phone and software version.
Step 5: Check your roaming settings
This is an easy step to overlook.
If you're using a travel eSIM for data, make sure your home SIM isn't accidentally being used for mobile data.
Depending on your phone and provider, you may also need data roaming enabled on the travel eSIM for it to connect.
The correct setting isn't always the same for every travel eSIM, so follow the activation instructions supplied by your provider.
Step 6: Test your connection
Before deleting or changing anything else, test the new connection.
Open a website.
Load Google Maps.
Send a WhatsApp message.
Try something that requires mobile data.
Once you're confident the new eSIM is working, you're ready to continue your trip.
What Happens to Your Old eSIM?
That depends on what you do with it.
If you simply switch your mobile data line:
The old eSIM remains installed.
If you turn the old line off:
The eSIM remains on your phone but isn't active.
If you delete it:
The eSIM profile is removed from your device.
These aren't the same thing.
If you're unsure whether you'll need the old plan again, leaving it installed is generally the safer option.
Can You Switch Back to Your Old eSIM?
Potentially, yes.
If the old eSIM is still installed, still valid and the provider allows it to reconnect, you may be able to switch back to it.
For example:
You start with Provider A.
You switch to Provider B because you're visiting another country.
Provider B turns out to have poor coverage.
If Provider A's plan is still valid and available, you may be able to switch back.
This is another reason not to delete your old eSIM unnecessarily.
What If You Run Out of Data Completely?
This is where planning ahead matters.
If your current eSIM reaches its data limit, you may lose mobile internet access.
At that point, installing another eSIM can be more difficult because activation may require an internet connection.
You could connect to:
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Hotel Wi-Fi
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Airport Wi-Fi
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Café Wi-Fi
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A friend's hotspot
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Your existing SIM if roaming is available
Then install your replacement eSIM.
The better approach is to buy your replacement before you completely run out of data.
You don't have to activate it immediately. Depending on the provider's activation rules, you can often have the new eSIM ready before you need it.
Can You Change Plans Without Changing Providers?
Sometimes.
Some eSIM providers allow you to top up an existing plan or purchase another plan through their platform.
Others require you to purchase a completely new eSIM.
This is why it's worth checking the provider's rules before assuming you can simply add more data.
If your current plan supports top-ups, that may be the easiest option.
If it doesn't, purchasing another eSIM can be a straightforward alternative.
Is It Better to Switch eSIMs or Buy a Multi-Country Plan?
It depends on your trip.
A single-country eSIM may be better if:
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You're staying in one country
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You want a simple setup
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You only need data for a short period
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You found a good local plan
A multi-country eSIM may be better if:
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You're visiting several countries
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You're moving frequently
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You don't want to install multiple eSIMs
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You want one plan covering the whole trip
For example, someone travelling through France, Switzerland, Italy and Spain might prefer one regional plan rather than managing four separate eSIMs.
But if you're travelling to a country outside your existing plan's coverage, adding another eSIM can still make sense.
Can You Reuse an eSIM? How eSIM Expiration and Reusability Work
What About RoamEZY?
If you're travelling across several destinations, RoamEZY can be useful when you want a travel eSIM rather than relying on expensive international roaming.
RoamEZY offers travel eSIM plans covering individual destinations as well as multi-country options, so you can choose a plan based on where you're travelling and how much data you expect to use.
If your existing plan isn't suitable for the next part of your trip, you don't necessarily have to wait until you get home.
You can install another compatible travel eSIM while you're abroad and switch your mobile data connection when you're ready.
The key is to check the plan's countries, data allowance and validity before buying.
5 Mistakes to Avoid When Switching eSIMs
Switching is relatively simple, but there are a few mistakes worth avoiding.
1. Deleting your old eSIM immediately
Don't delete it unless you're sure you won't need it again.
Keep it installed if there's still a chance you'll switch back.
2. Waiting until you have zero data
Install your replacement while you still have internet access.
It makes troubleshooting much easier.
3. Forgetting which SIM is using data
After switching, check your mobile data settings.
You don't want your phone quietly using your home SIM for data abroad.
4. Assuming unused data transfers
It normally doesn't.
Your old plan and new plan are separate services.
5. Buying a plan without checking coverage
More data doesn't help if the plan doesn't cover the country you're visiting.
Always check the destination list before purchasing.
Can You Switch eSIMs on a Flight?
Technically, installing or switching an eSIM can be possible while travelling, but it's not something I'd recommend relying on during a flight.
You may not have a reliable internet connection for activation, and airline Wi-Fi may have restrictions.
A better approach is to prepare before you leave the airport or before your current plan runs out.
Install first. Switch when ready. Test the connection.
That gives you a much safer setup.
The Best Way to Manage Multiple eSIMs While Travelling
If you're someone who travels regularly, a little organisation can make this much easier.
Keep your eSIMs clearly labelled.
For example:
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UK
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Europe 2026
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USA
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Asia
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Global
If your phone lets you rename your mobile plans, use names that make sense rather than leaving several lines with generic labels.
Also keep your original activation email or QR code somewhere secure in case you need to refer back to the provider's instructions.
Most importantly, don't delete a working eSIM simply because you aren't currently using it.
Final Thoughts
You can absolutely switch eSIMs in the middle of a trip.
In fact, that's one of the useful things about eSIM technology. You don't need to physically remove a SIM card every time your connectivity needs change.
The key thing to remember is that switching eSIMs doesn't combine your data allowances.
Your old plan remains separate from your new plan. If it still has data and hasn't expired, you may be able to use it again. If you delete it, however, getting it back may not always be straightforward.
So if you're changing providers or plans while travelling, the safest strategy is simple:
Install the new eSIM while you still have internet. Keep the old one installed. Switch your mobile data to the new plan. Test it. Then carry on with your trip.
That way, changing your connectivity doesn't have to mean starting your trip over again.