L'équipe Texto SMS Gratuit
20 September 2026 · 12 min read
Introduction: the QR code you can no longer scan
Friday evening, new phone unboxed. You go looking for the SIM tray: there isn't one. Your old phone has an active eSIM — no chip to move across, nothing to slide from one device to the other. Your carrier's app offers to "transfer my line", asks you to authenticate… and sends you a code by text message. On the very line you're in the middle of moving.
You eventually get hold of a QR code, but it has to be displayed on a screen so the new phone can scan it. Your old phone is switched off, mid-factory-reset. It's 10 p.m., and customer service reopens on Monday.
The eSIM isn't a gimmick: it's the GSMA standard that is gradually replacing the plastic card, and in 2026 virtually every mid-range and high-end smartphone sold in France supports it. Every French network operator offers it, and most MVNOs have followed suit. But moving to a "dematerialised" SIM changes some very concrete things: how you switch phones, what to do if yours is stolen, and above all a new dependency on having a working screen. This guide covers all of it.
What an eSIM actually is (and what it changes)
An eSIM (embedded SIM) is a chip soldered onto the phone's motherboard. It is not "a SIM in the cloud": it's a hardware component, exactly like a traditional SIM, except its contents — the carrier profile — are downloaded remotely rather than written at the factory.
Three practical consequences:
- The profile is downloadable, not transferable. You don't "take an eSIM out" of a phone. You delete a profile on one side and download a new one on the other. Some manufacturers now offer direct device-to-device transfer, but only between devices of the same brand and if the carrier allows it.
- A profile is generally single-use. The QR code your carrier provides is not an infinitely reusable ticket: once the profile is installed, the code is spent. Hence the need to request a new QR code every time you change device — sometimes free of charge, sometimes not (see below).
- Several profiles can coexist. Most recent smartphones store 5 to 10 eSIM profiles, one or two of which can be active at the same time. That's what lets you keep a French line and a local line abroad without juggling chips.
Key point: an eSIM changes neither your number, nor your contract, nor your rights. All that changes is the physical medium carrying your network identity.
eSIM, iSIM, eUICC: the minimum vocabulary
- eUICC: the technical name for the chip capable of hosting several downloadable profiles.
- eSIM: the consumer-facing use of that chip.
- iSIM: the next step — the SIM built directly into the phone's processor, now appearing on some models. From the user's point of view, it works exactly the same way.
How to activate an eSIM with a French carrier
The procedure varies little from one carrier to another. There are three routes:
| Situation | What you get | Typical wait |
|---|---|---|
| New sign-up online | QR code by email or in your online account | A few minutes to a few hours |
| Plastic SIM → eSIM migration | QR code or direct activation in the carrier app | Immediate to 24 hrs |
| Replacement (new phone, lost profile) | New QR code, old profile deactivated | Immediate to 48 hrs |
Installation always follows the same logic on the phone side: Settings → Mobile network / Cellular data → Add eSIM, then scan the QR code or enter the credentials manually (SM-DP+ address and activation code).
A few concrete points the instruction leaflets gloss over:
- You need an internet connection to download the profile. With no Wi-Fi and no other active line, you're stuck. Plan to be at home, or on a trusted network, before you start.
- The QR code has to be displayed on another screen (computer, tablet, or printed out). That's pitfall number one: never factory-reset the old phone before the new profile is installed and working.
- Print or save the activation page with the manual credentials. If the camera refuses to scan (scratched screen, brightness, reflections), manual entry saves the day.
- Name your lines once they're installed ("Personal", "Work", "Travel"). On a phone with two active profiles, a clear label stops you calling from the wrong line and racking up out-of-plan charges.
The cost of a replacement
Carriers often charge for a replacement physical SIM (usually around ten euros). For eSIMs, practices differ: some issue new profiles free of charge, others apply the same fee as for a plastic card, and others still give you the first one free then charge for the rest. Check the "SIM / eSIM duplicate" line in your plan's pricing terms before switching devices repeatedly — it's an invisible cost item right up until you trigger it.
Changing phones on an eSIM: the method that keeps you connected
This is the operation that generates the most customer service calls. Here's the order that works in the vast majority of cases.
- First of all, back up the old phone (iCloud, Google One, local backup) and check that your two-factor-authenticated accounts don't rely exclusively on SMS. Move your codes over to an authenticator app or write down your backup codes.
- Set up the new phone and connect it to Wi-Fi. Don't reset the old one yet.
- Open your carrier's app on the new phone if it offers a line transfer, or fetch the QR code from a computer.
- Install the profile on the new phone, wait for the network to appear, then make a test call and send a test text.
- Only then delete the profile on the old phone and reset it if you're selling it on.
On iPhone as on recent Android devices, direct device-to-device transfer exists and works well when both phones are side by side, switched on and on the same Wi-Fi. It's the simplest route — but it assumes the old screen is still readable and responsive to touch. If your screen is cracked, a tempered glass screen protector fitted on day one will have saved you far more than the cost of a duplicate profile.
The dead screen scenario
This is the eSIM's structural weakness. With a plastic chip, a dead phone gives up its SIM in ten seconds: you slot it into an old backup handset and the line works. With an eSIM, you have to go through your carrier to get a new profile, which means authenticating — sometimes by SMS on the very line in question.
Two simple safeguards:
- Keep a basic backup mobile phone, eSIM-compatible or not: if it accepts a plastic SIM, ask your carrier for a spare physical card to keep in a drawer (some plans let you switch between the two formats from your online account).
- Check that your online account is accessible via email and password, not just by SMS code. Write the customer service number down on paper — the one thing you can never reach when your phone dies is the number stored in the phone that died.
Theft, loss, SIM swap: what changes with an eSIM
Good news first: an eSIM can't be pulled out of a stolen phone and slotted into another one. A thief doesn't get your line by moving a chip across. On that specific point, it's a genuine security gain.
Bad news next: fraud has shifted towards fraudulent profile requests. A fraudster who manages to impersonate you with customer service can have a new eSIM profile issued on their own device — and your line goes dead. The symptom is the same as with a classic SIM swap: sudden, unexplained loss of network.
Useful habits:
- Where your carrier offers it, enable a line lock option or a password/PIN required for any sensitive operation.
- Be wary of eSIM QR codes received in unsolicited emails: scanning an unknown profile amounts to installing a line you have no control over.
- If you lose network for an unexplained and prolonged period, call your carrier from another line before assuming it's a network outage.
The steps to follow after a theft are the same as ever: have the line blocked by your carrier, file a police report, and have the handset blocked via its IMEI. And do note your IMEI somewhere other than in the phone (it's on the original box and in your online account).
eSIM and travel: the use case that really converts people
This is often where the eSIM stops being a technical curiosity. Within the European Union, your French plan works under European roaming rules and a local eSIM is generally pointless. Outside Europe, however, the bill can get painful, and an eSIM lets you:
- keep your French number active for incoming traffic (banking codes, calls from family);
- add a local data profile bought online before you leave;
- switch mobile data over to the local profile and leave the French one on "calls/texts only".
Before buying a travel data plan, check three things: that your phone is not carrier-locked (unlocking is a right and is free on request once your commitment period has ended), that your destination really is covered by the advertised partner network, and that the profile installs before you leave — downloading requires an internet connection, and the arrivals terminal is not the ideal place to discover a faulty QR code.
For long journeys, a high-capacity power bank is no luxury: constantly searching for a network across two carriers drains a phone far faster than normal use.
Dual lines: the most underrated use at home
A phone able to run two active profiles lets you separate two uses on a single device: a main line and a second line dedicated to sign-ups, classified ads and deliveries. You choose, line by line, which number is used for calls, for texts, and which one carries mobile data.
Two limitations to be aware of:
- Simultaneous calls. In a DSDS (Dual SIM Dual Standby) setup, still the most common, only one line can be in a call at a time; the other goes to voicemail in the meantime.
- Battery life. Two active lines means two network attachments, so slightly higher consumption. On a phone whose battery is already tired, you'll feel the difference.
If you use the second line for work, a smartphone desk stand stops you reaching for the phone at every notification and helps keep the boundary between the two uses.
Checks to make before you switch
Before requesting migration from your plastic SIM to an eSIM, tick off this list:
- My phone is eSIM-compatible — check in the network settings, or by dialling the code that displays the EID (the eSIM chip's identifier). No EID, no eSIM.
- My phone is unlocked if I plan to add a foreign profile.
- My carrier account is accessible with a username and password I actually know, and an up-to-date email address.
- My two-factor authentication doesn't rely solely on SMS to this line.
- I know what a duplicate profile costs with my carrier.
- I've backed up my contacts somewhere other than the SIM: an eSIM doesn't store a contact list, contrary to what many people still believe. For a handful of vital numbers, a paper address book remains the most reliable backup there is.
Should you switch to eSIM?
Objectively, yes in most cases — with one caveat.
The arguments in favour: no chip to lose or cut down to size, immediate activation with no waiting for the post, easy management of multiple lines, better protection against physical SIM extraction, and improved water resistance on phones with no tray. Environmentally, doing away with millions of plastic cards and their logistics is no small thing.
The caveat: you become dependent on your carrier every time you change device. Where a chip used to move across in ten seconds without asking anyone's permission, an eSIM profile requires reachable customer service, an accessible online account, and a working screen. For business-critical use, keep a plan B: a spare physical SIM if your plan allows it, or a second device already set up.
In practice, the choice will increasingly be made for you: models with no SIM tray are multiplying, and migration will become the default. So you may as well prepare for it in good conditions — on a Friday afternoon, with Wi-Fi, an up-to-date backup and a computer switched on beside you — rather than being forced into it on the evening your phone dies.
The essentials in five points
- An eSIM is a physical, soldered chip; it's the profile that is dematerialised.
- An activation QR code is in principle single-use: don't half-spend it.
- Install the new profile before deleting the old one. Never the other way round.
- A broken screen makes recovering your line trickier than with a plastic card: make sure you have access to your online account that doesn't depend on SMS.
- Outside Europe, a dual-line eSIM setup is the simplest way to keep your French number while paying local rates for data.
