Here's the bottom line. Most cases of getting stuck on SMS verification while abroad can be greatly reduced with a little preparation before you leave. There are three key steps: ① wherever possible, switch two-factor authentication that relies on SMS over to an authenticator app, ② write down or save your backup codes, and ③ review your login details and recovery contact methods. A data-only eSIM like Bloomy can't send or receive SMS, so setting up methods that don't depend on SMS before you travel gives you real peace of mind. (Information as of June 2026. The specifications of each service can change, so always check the official source for the latest details.)
- Switching SMS-based two-factor authentication to an authenticator app before departure brings peace of mind
- Keep your backup codes safe by writing them on paper or storing them in a password manager
- Check and update your recovery email, contact methods, and passwords before you travel
- A data-only eSIM can't handle phone calls or SMS, but app-based calls such as WhatsApp work fine
- Preparing before you leave reduces SMS verification headaches far more than scrambling on arrival
This article is for anyone who has ever been caught out by SMS verification abroad, or who simply doesn't want to be left scrambling on their next trip. It focuses on what to do before you leave. For what to do once a problem has already happened—SMS messages not arriving, verification not going through—see What to Do When SMS Verification Won't Work Abroad: Data-Only eSIMs and Two-Factor Authentication. Reading both together covers you for preparation and for the day itself.
Why preparing before you travel cuts down on SMS verification problems
When people run into trouble with SMS verification abroad, there are usually a few common reasons behind it. If you've turned off your home mobile line, you're not using roaming, or you're connecting through a data-only eSIM alone, an SMS sent to your home phone number may never reach your device. In other words, much of what "goes wrong on the ground" comes down to the connectivity choices you make before departure and how prepared your authentication methods are.
Put another way, if you set up authentication methods other than SMS in advance, there will be far more situations where you can still log in even when SMS doesn't arrive. Most of this preparation takes only a few minutes, and it makes a big difference to how relaxed your trip feels.
First, check: how does each of your accounts verify you?
The first step is to understand which services verify your identity, and how. List out the apps and services you use most, and map out their authentication methods.
| Authentication method | How reliably it reaches you abroad | What to prepare before you travel |
|---|---|---|
| SMS (to a phone number) | May not arrive depending on your line or eSIM type | Switch to an authenticator app where possible, or keep an alternative method ready |
| Authenticator app | Can generate codes even offline, as long as you've set it up | Register the app before you leave |
| Email verification | Easy to receive if you have a data connection | Confirm an email address you can actually access |
| Backup codes | Work without any connection if saved in advance | Print them and store them somewhere safe |
This table is only a general guide. The methods each service supports vary, so check the actual options in each service's security settings.
The basic flow for moving SMS verification to an authenticator app
Many services let you choose an authenticator app that generates codes on your phone, as an alternative to SMS-based two-factor authentication. As long as you have a data connection, an authenticator app can display a code, making it much easier to log in even when SMS won't reach you. The general steps are as follows.
- Install the authenticator app you want to use on your device (before you leave, on a stable connection at home).
- Open the security or two-factor authentication settings for the service in question.
- Use an option like "Add an authenticator app" to display a QR code, and scan it with your authenticator app.
- Enter the six-digit (or similar) code that appears to confirm the link.
- If backup codes are issued at the same time, be sure to save them.
Things to watch for when switching
If code generation can't be carried over when you change phones or reinstall the app, you may find yourself locked out. It's worth checking in advance how to transfer your setup and whether a cloud backup is available. Keep in mind, too, that not every service supports authenticator apps.
Prepare backup codes and recovery options
For services that don't support an authenticator app, or in case you lose your device, keeping backup codes is extremely useful. Rather than relying on a screenshot alone, store your issued codes in more than one place—such as writing them on paper and saving them in a password manager—so they're there when you need them.
- Check that you can receive recovery emails while abroad.
- Make sure you have one way to reach a trusted person, such as a family member.
- Update and make a note of the passwords for your important accounts before you leave.
What data-only eSIM users especially need to keep in mind
Most travel eSIMs, including Bloomy, are fundamentally data-only. A data-only eSIM cannot receive SMS messages sent to a phone number, nor make voice calls. It's important to understand that verification codes delivered by SMS cannot be received on a data-only eSIM.
If you do need a phone number or SMS, consider an additional approach alongside it—such as temporarily enabling your home mobile line, using roaming, or keeping a separate service that comes with a number. On the other hand, app-based calls and in-app notifications through services like WhatsApp may work as long as you have a data connection. Shifting your everyday communication and identity checks over to apps makes it easier to manage even on a data-only eSIM.
If you'd like to figure out how much data and how many days you'll need at your destination before choosing a plan, you can search by country, data amount, and length of stay on our eSIM comparison page. Plan details and terms may change, so please check the latest information shown before you buy.
Pre-departure checklist
- Listed out the authentication methods for the services you use most.
- Moved everything that can be switched over to an authenticator app.
- Saved your backup codes and stored them somewhere safe.
- Confirmed your recovery email and contact methods.
- Understood that SMS won't arrive on a data-only eSIM, and considered the alternative methods you'll need.
- Checked in advance how and when to set up and activate your eSIM.
If you're unsure about the eSIM setup process itself, reviewing our setup guide beforehand will make things go more smoothly once you arrive.
In summary: a little preparation keeps you calm on the ground
When it comes to SMS verification abroad, preparing before you leave tends to work out far more smoothly than trying to sort it out on the spot. Switch to an authenticator app, save your backup codes, and understand how a data-only eSIM behaves—cover those three points and you'll have more ways to log in even when SMS doesn't come through. If you do end up stuck on SMS verification on the ground, follow the steps in What to Do When SMS Verification Won't Work Abroad: Data-Only eSIMs and Two-Factor Authentication. For the finer details of each service and the latest specifications, please check alongside each provider's official guidance.
