The travel notebook Staying in touch
eSIM, WhatsApp and texts: what changes abroad
Separate app chats, calls and SMS. Choose your data line, keep access to your usual number and prepare account verification before travel.
The quick answer
A data-only eSIM can connect WhatsApp to the internet, but it cannot receive texts sent to your usual phone number. Those need access to the original line. If you also need ordinary phone calls, check that your package includes calls and texts.
Airalo — Calls and texts with an eSIMAiralo — eSIMs and phone numbers
Keep in mind
An internet connection and a phone number do different jobs.
Turning off data roaming does not turn off calls and texts.
Prepare account access before you leave.
Start with what you need to do
| You need to… | Prepare… | Check… |
|---|---|---|
| Message or call in an app | A data connection and an app already set up | That the recipient uses the same service |
| Receive texts on your usual number | Access to the line attached to that number | Your carrier’s voice/text roaming and coverage |
| Call a hotel or restaurant’s phone number | A service that includes phone calls | Which countries and numbers are included |
| Receive an account verification code | The account’s required verification method | Whether it uses SMS, an app or another channel |
References: Airalo — Calls and texts with an eSIMAiralo — Calls with a data-only eSIMAiralo — eSIMs and phone numbers
Give each line a clear job
Label your lines so that you can tell them apart, for example “Home” and “Travel”. On iPhone, choose your data line in Cellular or Mobile Data settings; on Pixel, look under Network and Internet → SIMs. Menu names vary with system version and language.
Check calls, texts and mobile data preferences separately. If you want data to stay on your travel eSIM, review automatic data switching too. Keeping your home number active does not mean every use of that line is covered by your travel package.
References: Apple — Dual SIM with an eSIMGoogle — Dual SIM on Pixel
Before you leave your home Wi-Fi
Tick the checks as you prepare your phone. Ticks only remain on this page.
References: Airalo — Calls with a data-only eSIMAiralo — eSIMs and phone numbers
Internet works, but a code does not arrive
If a webpage opens with Wi-Fi turned off, you have separated your data connection from the verification issue. Check the number shown by the service and the channel it uses for the code. A new data eSIM does not replace the SIM associated with your old number.
Check whether the original line is enabled and connected to a network. For an account-specific problem, use that service’s recovery process; if all texts are missing from the line, contact your carrier. Buying more data is not a fix for SMS reception: they are different functions.
If you need neither calls nor texts on your home number, you can choose to turn that line off. First check that you will not need it for account access during the trip.
References: Airalo — eSIMs and phone numbers
Frequently asked questions
Do I need to change my number for a data eSIM?
Buying a data eSIM does not require replacing your usual number. Set up the data connection separately and follow the app’s instructions if you need to register an account again.
Do WhatsApp calls use my phone minutes?
They are internet calls, using the available Wi-Fi or mobile data connection. A call started in your phone’s dialler may use your voice line and its rates instead.
Is turning off my main SIM’s data roaming enough?
That controls data. Your carrier’s conditions still apply to calls, texts and other services on that line; turning the whole line off is a separate setting.
Sources and method
An editorial guide based on the official documentation listed here. Checks refer to sources, not hands-on testing. Menus, availability and terms can change: your package’s instructions take precedence.
- Airalo — Calls and texts with an eSIM
- Airalo — eSIMs and phone numbers
- Airalo — Calls with a data-only eSIM
- Apple — Dual SIM with an eSIM
- Google — Dual SIM on Pixel
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