Sophie
19 октября 2026 г. · 12 мин чтения
You land in Bangkok, Mexico City or Marrakech, you buy a local prepaid SIM for €5 to get cheap data, and you tuck your French SIM away in its little pouch. Three days later your bank blocks a payment because you never received the code sent by text, and your brother is worried because his messages "went through". This isn't a bug: an SMS never follows a SIM card, it follows a number attached to a network. If your French line is no longer attached to any network, texts wait, then die.
Updated 19 October 2026.
Why do you stop receiving your French texts when you insert a local SIM?
Because an SMS isn't delivered "to the phone" but to the line, via the network where that line is registered. As soon as your French SIM is removed, your operator no longer knows where to reach your number: the message stays queued in its message centre (SMSC), which retries delivery until the validity period runs out, then deletes it. The sender, meanwhile, sees nothing out of the ordinary.
In other words, removing your SIM is exactly the same, from the network's point of view, as switching your phone off for two weeks. The mechanism is the store and forward process described in the GSM standard, and we covered it in detail in our article on what happens to a text message sent to a phone that is switched off: retention from a few hours to a few days depending on the operator, then silent destruction.
Two very concrete consequences:
- Personal messages arrive in a burst the day you put your French SIM back in… or never, if the validity period expired in the meantime.
- One-time codes (bank, tax office, social networks, two-factor authentication) are lost either way: even if delivered later, they only live for a few minutes. That's the real danger of travelling with a local SIM.
Does a local SIM let me receive texts sent to my French mobile number?
No, never. This is the most widespread misunderstanding. The local SIM gives you a different number, attached to a different operator (Telcel in Mexico, Movistar in Spain or Latin America, Vodafone in Italy, Maroc Telecom, and so on). It has no link whatsoever with your French line, and there is no automatic "transfer" between the two.
So you need to separate three things that travellers often confuse:
| What you want | What makes it possible | What doesn't |
|---|---|---|
| Cheap data on the spot | Local SIM or eSIM, travel plan | Your French SIM alone outside the EU |
| Receiving texts sent to your French number | French line active on a network (dual SIM, eSIM, roaming) | Local SIM, Wi-Fi alone |
| Sending a text to France | Local SIM (international rate) or SMS from the internet | Nothing automatic |
If you're travelling within the European Union, the problem barely arises: your French plan works just as it does at home, texts included, and buying a local SIM serves no purpose. We described the applicable framework in our guide on what changes for your texts and calls in Europe. The subject of this article is travel outside the EU, where a local SIM becomes financially tempting.
How long does a text wait before it is lost?
Anywhere from a few hours to a few days: the validity period is a setting in the SMSC of the sender's operator, not a legal rule. In practice, French operators hold personal texts for something in the region of one to several days; automated messages sent by banks or government bodies often have a deliberately very short validity.
What this means for a trip:
- A weekend without your French SIM: most personal messages will arrive when you get back.
- Two weeks without your French SIM: some are permanently lost, and you'll never know which ones.
- Verification codes: lost in every case, since they expire before they can be delivered.
The sender isn't notified. And the delivery receipt, where it exists, isn't reliable internationally: we explain why in our article on SMS delivery receipts and the lies they tell abroad.
How can you keep your French number reachable while using a local SIM?
There are four possible setups, from the simplest to the most makeshift. The right choice depends on your phone and the length of your stay.
1. Physical dual SIM: both lines at the same time
If your phone has two nano-SIM slots, you keep the French SIM in slot 1 and the local SIM in slot 2. The result: texts arrive on your French number (while roaming, so free to receive but charged to send outside the EU), and you use the local SIM's data.
The settings to configure, on Android as on iPhone, in order:
- Turn off data roaming on the French line (Settings → Cellular Data / SIM cards → French line → Data Roaming: off).
- Set the local SIM as the default data line.
- Keep the French line for incoming texts, and check that it is indeed set to "On".
- Disable MMS on the French line: they need data roaming, so they'll stay stuck. The reason why is explained in detail in our article on MMS not received abroad.
A physical precaution: the SIM tray is very easy to lose while travelling, and the hotel paperclip doesn't open every model. A SIM card storage case with a built-in ejector tool costs a few euros and saves you hunting for a pin at midnight in an airport.
2. Local eSIM + physical French SIM: the most comfortable setup
This is currently the best compromise on a recent phone. You leave your physical French SIM in place and add a travel eSIM downloaded before departure, via QR code. No tray to open, no card to lose, and you can switch from one profile to the other in the settings.
Watch out for two real limitations:
- A compatible and unlocked phone is essential. Models sold before 2019-2020 often have no eSIM.
- Downloading the profile requires an internet connection: do it from home, before boarding, not on arrival over an overloaded airport Wi-Fi.
We've covered activation, transfer and pitfalls in our guide eSIM: activation, moving to a new phone and pitfalls.
3. A second phone: the solution for long stays
An old unlocked smartphone, left switched on with the French SIM and your accommodation's Wi-Fi, receives your texts while your main phone runs on the local SIM. Two conditions: the device must stay attached to a mobile network (Wi-Fi alone isn't enough for standard SMS, unless your operator allows texts over Wi-Fi calling), and it must stay charged.
This is where a 10,000 mAh power bank and a multi-port mains charger stop you juggling a single socket. Also think about a universal plug adapter: outside Europe, the French plug fits nowhere.
On the usefulness of calls and texts over Wi-Fi when there's no mobile network, see our article devoted to Wi-Fi calling as a free solution.
4. Forwarding and operator services: check before you leave
Call forwarding is available with every French operator. SMS forwarding, however, is not a standard service: some operators offer a notification option or online access to received texts, others nothing at all. Check in your account before departure, not once you're abroad.
Billing rules differ from one operator to another; the official pricing terms from Orange, SFR, Bouygues Telecom and Free Mobile are the only binding documents. Arcep also publishes background material on roaming and SMS usage in its publications and observatories.
What do you do about SMS verification codes when travelling far from home?
This is the point to sort out before you leave, because there's nothing you can do once you're there. Three measures, in order of effectiveness:
- Switch two-factor authentication to an authenticator app (codes generated offline) or to printed backup codes, rather than SMS. Most banking services and social networks allow this.
- Tell your bank about the trip and note down the number to call from abroad (it's written on the back of the card): a video call or an in-app approval often replaces the text message.
- Keep the French line attached to a network using one of the setups above, at least during the few days when you're expecting a sensitive transaction.
A paper travel notebook for copying out emergency numbers, backup codes and booking references remains the most reliable backup: it works on 0% battery.
How do you send a text to France from a local SIM?
Using the international E.164 format: +33 followed by the number without its leading zero. So 06 12 34 56 78 becomes +33612345678. It's the only way of writing it that works from any network in the world, and it's also the format to use when saving numbers in your contacts before you leave.
The classic mistakes — keeping the 0, mixing up 00 and +, forgetting the country code — are reviewed in our article on the foreign number saved incorrectly. The same principle applies in the other direction.
On pricing, a text sent from a local SIM to France is an outgoing international SMS billed by the local operator, often more expensive than a domestic text but nowhere near French out-of-plan rates outside the EU. Three free or near-free alternatives:
- an internet messaging app (using the local SIM's data or Wi-Fi), provided the person you're writing to uses the same one;
- RCS, which goes over data rather than the SMS network, but only between compatible, activated devices;
- an online SMS sending service, useful when the person you're writing to only has a basic phone. You can send a text from this page and check the terms on the pricing page.
On the shift between texting and messaging apps, our analysis RCS versus SMS: why texting is losing ground provides the French context.
Local SIM or French plan outside the EU: which is better?
It depends almost entirely on the length of the trip and on how much data you use.
| Criterion | Local SIM / eSIM | French plan roaming outside the EU |
|---|---|---|
| Data cost | Very low | High without an add-on, often capped by volume |
| Texts received on your French number | Lost if the French SIM is removed | Received normally |
| Texts sent | Local rate to international | Out of plan, per message, sometimes expensive |
| Number usable for banking codes | No | Yes |
| Setup | QR code or purchase on arrival | Nothing to do |
The winning setup for a stay of more than a week outside the EU on a recent phone: keep the French SIM in place and active for incoming texts + a local eSIM for data, with data roaming switched off on the French line. For a weekend, simply keeping your French plan with data turned off is almost always enough.
For more on costs outside Europe, see our guide Texts and data outside the European Union: avoiding the €300 bill. And if you find once you're there that you can receive texts but not send any, the cause usually lies elsewhere: we explain it in Texts received but impossible to send abroad.
The checklist before leaving with a local SIM
- Save all important contacts in
+33…format. - Check that the phone is unlocked and, where relevant, eSIM-compatible.
- Download the travel eSIM while still in France.
- Move two-factor authentication away from SMS to an app or backup codes.
- Note down your bank's card-blocking number reachable from abroad.
- Switch off data roaming on the French line, leaving the line active.
- Disable MMS on the French line.
- Pack a SIM card ejector tool and a plug adapter.
Frequently asked questions
If I remove my French SIM, will my texts arrive when I get back?
Only some of them. Those whose validity period hasn't expired will be delivered as soon as your line reconnects to the network; the rest have been deleted by the message centre, with no notification either for you or for the sender.
Can I receive my French texts over Wi-Fi, with no mobile network?
Only if your operator offers Wi-Fi calling and texting and your line is eligible, which depends on the operator and the country you're connecting from. Standard SMS needs an attachment to the mobile network; internet messaging apps and RCS, on the other hand, work over Wi-Fi.
Does a travel eSIM keep my French number?
No. A travel eSIM provides a foreign number or simply data access, depending on the offer. Your French number stays on your original SIM (or eSIM), which you need to keep active in order to carry on receiving your texts.
How do I text a Telcel or Movistar number from France?
With the country code followed by the national number without its leading zero: +52 for Mexico (Telcel), +34 for Spain (Movistar Spain). The E.164 format is the same for all operators in a given country: it's the country that determines the code, not the operator.
Will my old backup phone still be able to receive texts?
Not necessarily: with the gradual shutdown of 2G and 3G, devices that support neither VoLTE nor 4G lose voice and SMS on the networks concerned. Check compatibility before making it your backup phone for a trip.
