How to Use Dual SIM with a France eSIM and Keep Your Home Number Active
Every week, threads pop up on TripAdvisor and Reddit that all boil down to the same worry: “If I get a French eSIM, will I miss calls from home?” It is one of the most common travel tech questions out there, and the good news is the answer is a clear no. With a dual SIM setup, your home number stays completely active while your France eSIM handles all your data. You do not have to choose between the two.
This guide walks you through exactly how it works, why it is safer than you think, and how to set it up properly on both iPhone and Android before you board that flight to Paris.
TL;DR
Modern smartphones can run two lines simultaneously using dual SIM technology. You keep your physical home SIM in your phone for calls and texts, add a france esim with number as a second digital line, and assign all mobile data to the eSIM. Your home number receives calls and texts as normal. You pay local French data rates instead of eye-watering roaming charges. The setup takes about five minutes and you can do it from your sofa before you travel.
What Is Dual SIM and Why Does It Matter for Travelers?
Dual SIM simply means your phone can hold and run two mobile plans at the same time. On most modern phones this is a physical SIM card in the tray plus a digital eSIM profile stored in the device’s chip. Some newer models, including iPhone 13 and later, can run two eSIMs simultaneously without a physical card at all.
For a traveler heading to France, this matters enormously. Instead of the old-school approach of pulling out your home SIM and replacing it with a local one, you leave your home SIM exactly where it is and install a French eSIM alongside it. The two lines operate independently. You tell the phone which line to use for data and which to rely on for calls. That is the entire trick.
The result is that your mum back in Bristol or your colleague in Chicago can still call your usual number and you will pick up just fine. Meanwhile, your apps, maps, and browser run on a local French plan that costs a fraction of international roaming.
The Core Worry: Will I Actually Miss Calls?
This is the fear that drives so many forum posts. People assume that installing a foreign SIM means their old number goes dark. That was true in the physical SIM era when swapping cards literally disconnected your home plan. Dual SIM changes that entirely.
When you run both lines, your home SIM remains active. It connects to the network, receives incoming calls, receives SMS messages including bank one-time passcodes, and works exactly as it would at home. The only thing you switch off on your home line is mobile data roaming, which prevents unexpected charges. Voice and SMS keep working without data roaming being on.
So if your bank sends a verification code to your UK number at 2am Paris time, it arrives. If someone calls your home number while you are queuing at the Louvre, your phone rings. Nothing is missed.
What You Need Before You Start
There are a few things to check before you set anything up. First, confirm your phone supports eSIM. Most iPhones from the XR onwards and most Android flagships from 2019 onwards do. You can check on iPhone by going to Settings, then General, then About and looking for an EID number. On Android, go to Settings, then Network, then SIM and look for an option to add an eSIM. If those menus exist, you are good.
Second, your phone must be unlocked. A carrier-locked device may refuse to activate a second SIM from a different provider. Contact your carrier if you are unsure. Third, you need to purchase your eSIM plan before or just after arrival. Getting a france esim with number that includes a French phone number means you also get a local number for making French calls at local rates, on top of keeping your home number active for incoming calls.
Setting Up Dual SIM on iPhone: Step by Step
Apple has made this process fairly seamless on recent iOS versions. Here is how to do it from scratch.
Step 1: Install Your France eSIM
Once you have purchased your plan, your provider will send you a QR code by email. On your iPhone, go to Settings, then tap Cellular or Mobile Data. Tap Add eSIM or Add Data Plan. Point your camera at the QR code when prompted. Your iPhone downloads and installs the eSIM profile in about thirty seconds. If your provider supports activation codes instead of QR codes, there is usually a manual entry option on the same screen.
Step 2: Label Your Lines
iOS will ask you to label the new plan. Use something obvious like Travel France or simply France. Your existing home plan should already have a label, but if it does not, give it one now such as Home or UK Number. Clear labels prevent confusion later when you are jet-lagged and trying to figure out which line you are calling from.
Step 3: Set Your Data Line to France eSIM
Go to Settings, then Cellular or Mobile Data. Tap Cellular Data and select your French eSIM. This tells your iPhone to route all internet traffic through the French plan. Your home SIM is now data-free, which means no accidental roaming charges on that line.
Step 4: Turn Off Data Roaming on Your Home Line
Still in Cellular settings, tap on your home plan line. Find Data Roaming and make sure it is switched off. This is the safety net that prevents your phone from accidentally billing your home plan for data if the French eSIM has a signal dropout. Voice and SMS will still work on this line regardless.
Step 5: Set Your Default Voice Line
Tap Default Voice Line and choose your home plan. This ensures outgoing calls use your familiar home number by default. You can always override this on a call-by-call basis by selecting the line manually in the Phone app.
Step 6: Check iMessage and FaceTime
Go to Settings, then Messages, then Send and Receive. Make sure your home number and Apple ID email are both ticked. This keeps iMessage working reliably even while data comes from the French eSIM. Do the same in FaceTime settings.
Setting Up Dual SIM on Android: Step by Step
Android menus vary by manufacturer but the logic is the same across all devices. The steps below reflect the most common layouts you will encounter on Google Pixel and Samsung Galaxy handsets.
Step 1: Install the eSIM Profile
Go to Settings, then Network and Internet or Connections depending on your device. Tap SIM Manager or SIMs, then look for an option labelled Add eSIM or Download a SIM. Scan your provider QR code or enter the activation code manually. The profile installs within a minute.
Step 2: Label Both SIMs
Once both lines appear in SIM Manager, tap each one and rename them. Home and France works perfectly. Samsung devices sometimes call this the SIM nickname. Labelling both lines correctly saves headaches throughout the trip.
Step 3: Set the Preferred Data SIM
In SIM Manager, find Preferred SIM for Mobile Data or similar wording. Select your French eSIM. This routes all app data, browser traffic, and maps through the local French plan.
Step 4: Disable Data Roaming on Your Home SIM
Tap your home SIM entry in the SIM Manager. Find Mobile Data or Data Roaming and switch it off. Again, this only cuts data on that line. Incoming calls and SMS keep arriving as normal.
Step 5: Choose Your Preferred Call SIM
Set your home SIM as the preferred line for calls and SMS. On Samsung this is under SIM Manager, Calls and Preferred SIM. On Pixel it is under Calls and SIM 1 or SIM 2. With this set, outgoing calls default to your home number.
Step 6: Disable Auto Data Switching
Some Android devices have an Auto Data Switching or Smart SIM feature that tries to swap data between lines automatically. Turn this off. You want the French eSIM as the fixed data line, not the phone second-guessing you.
What Happens to WhatsApp and Other Apps?
WhatsApp is registered to your phone number, not to a specific SIM. As long as your home SIM is active and can receive SMS for verification purposes, your WhatsApp account carries on completely unaffected. The data that powers your WhatsApp messages and calls can come from your French eSIM while the account identity stays tied to your home number. There is nothing to change in the WhatsApp app itself.
Banking apps work the same way. Your bank sends verification codes to your home number via SMS. Since your home SIM is still active and receiving texts, those codes arrive as normal. The only thing you have disabled on your home line is mobile data, and SMS does not need mobile data to function.
France eSIM With a Local French Number: The Extra Advantage
A standard data-only eSIM gives you internet access but no French phone number. If you want to call local French numbers at local rates, book restaurants, contact Airbnb hosts, or have a number that people in France can call without paying international rates, you need a france esim with number that includes a genuine French mobile number.
This is worth thinking about if you are staying for more than a few days or managing anything time-sensitive while you are there. You effectively become reachable on two numbers simultaneously: your home number for everyone who already knows you, and a local French number for contacts and services within France. Both ring on the same phone. It is the setup that business travelers and long-stay visitors have been quietly using for years.
Common Questions and Quick Troubleshooting
If your French eSIM has no signal after installation, the first step is to restart your phone. If it is still not connecting, check that Data Roaming is enabled on the eSIM line itself. Counterintuitively, you turn roaming off on your home line to avoid charges, but you may need to turn it on for the eSIM line so it can connect to French partner networks.
If your home number is not receiving calls, check that the line is still switched on in your SIM settings. Very occasionally, installing a new eSIM can cause the phone to turn off the other line as a default behaviour. Just go back into SIM or Cellular settings and make sure both lines are toggled on.
If your data is not working on the French eSIM, check the APN settings. Your provider may include APN details in their setup email. On iPhone, this is usually set automatically. On Android, you can enter it manually under your eSIM line settings in Mobile Networks, then Access Point Names.
Battery and Practical Tips for the Trip
Running two active lines does draw slightly more battery than a single SIM. In practice most people find the difference negligible, but if your phone is already struggling by mid-afternoon, you can put your home SIM line into a low-power state rather than disabling it entirely. The simplest approach is to keep the line on but with data roaming and background app refresh switched off, which is what you have already done by following the steps above.
Install the eSIM before you travel if possible, or at the latest while you are still connected to airport Wi-Fi on arrival. eSIM installation requires an internet connection, so having Wi-Fi available makes the process smoother. Once installed, the eSIM activates automatically when your phone detects a French network.
FAQs
Will people be able to call my home number while I am in France?
Yes. Your home SIM stays active and connected to its network throughout your trip. Incoming calls reach you exactly as they would at home. You do not need to do anything special to receive them.
Do I need to turn off my home SIM when using a French eSIM?
No. The whole point of dual SIM is that both lines run at the same time. You only switch off mobile data roaming on your home line to avoid charges. Voice and SMS on your home number continue working normally.
Can I make calls to French numbers at local rates with an eSIM?
It depends on your plan. A data-only eSIM does not include a local phone number or local calls. You would need a plan that includes a French number and voice minutes. Some providers offer eSIM plans with a full French number included, which gives you local calling rates on top of data access.
Does this work on older iPhones?
Dual SIM with eSIM works on iPhone XR, XS, and all models released after those. If you have an older iPhone, you may need to use a physical SIM swap instead, which means you cannot run both lines at once.
Will my bank OTPs still arrive?
Yes. Bank one-time passcodes are sent via SMS to your phone number. As long as your home SIM is active and not completely disabled, SMS messages arrive regardless of whether mobile data is enabled on that line.
What if my phone is carrier-locked?
A carrier-locked phone may prevent you from adding a second SIM from a different provider. Contact your carrier to request an unlock before your trip. Most carriers unlock phones on request, particularly if your contract is paid off or has been running for some time.
Is it better to get a France eSIM with a number or a data-only plan?
That depends on your trip. For a short holiday where you just need maps and messaging, a data-only plan covers most needs. For longer stays, business travel, or situations where you want to make local calls cheaply, an eSIM with a proper French number included gives you much more flexibility and a genuinely local presence.
