Keep Your Home Number Abroad While Using a Travel eSIM
The most useful thing about a dual SIM phone abroad is that you don't have to choose between cheap travel data and your home number. Your travel eSIM handles data, and your home line stays on to receive texts, including the one-time codes your bank, email and messaging apps send. The setup takes a couple of minutes, but one wrong switch can lead to roaming charges, so it's worth getting right.
The setup in one table
| Setting | Home line | Travel eSIM |
|---|---|---|
| Line turned on | Yes | Yes |
| Cellular data | No | Yes |
| Data roaming | Off | On |
| Calls and texts (default line) | Yes | No (usually data-only) |
| iMessage and FaceTime | Yes | No |
On iPhone, also turn off Allow Cellular Data Switching. On Android, turn off the equivalent setting, often called "switch mobile data automatically". Otherwise your phone may fall back to your home line's data when the travel signal dips, and your home carrier may charge roaming rates for it.
Will texts to my home number cost money?
Receiving texts is free with many carriers, but not all of them. Some charge for incoming texts or calls while roaming, and some apply a daily roaming fee as soon as your phone uses their network abroad. The rules depend on your carrier and plan:
- Check your carrier's international or roaming page for incoming text and call charges.
- Ask whether a daily fee is triggered by data only, or by any use, including receiving a call.
- If your carrier offers it, turn on Wi-Fi calling for your home line. On many carriers, calls and texts over Wi-Fi abroad are billed like domestic ones. Check your carrier's terms.
One-time codes: set up before you leave
Bank apps, password managers and messaging apps often send a verification code by text when you log in from a new device or location. Before you go:
- Log in to every important app once at home. Banking, email, cloud storage, ride-hailing and booking apps. Some apps ask for extra verification the first time they see a foreign IP address, which a travel eSIM may give you.
- Add an authenticator app or passkeys where possible. They work without a mobile signal.
- Write down backup codes for your most important accounts and keep them somewhere safe and offline.
- Set up apps you'll need abroad, such as ride-hailing, the local map app and rail booking, while your home number receives texts normally. Our Taiwan guide lists the apps visitors typically need there.
Calls while you're away
Your travel eSIM usually has no phone number, so:
- Calling home: use WhatsApp, FaceTime, Signal or another internet calling app over the travel eSIM's data.
- People calling you: calls to your home number reach you while your home line is on. Your carrier's roaming rates apply unless the call comes over Wi-Fi calling.
- Local businesses: if a hotel or tour operator needs to call you, give them a messaging app contact instead.
Phones that can't run two lines at once
Older dual SIM iPhones (XS to 12) can have one eSIM active alongside a physical SIM. If your home number is already an eSIM on one of those models, you can't use a travel eSIM at the same time. iPhone 13 and later can run two eSIMs at once. Android support varies by model. See what a travel eSIM is for compatibility notes.
Coming home
When you're back, switch off or remove the travel line and check that your home line is set for cellular data again. Otherwise you may find yourself with no mobile data at the airport. Turn your home line's data roaming setting back to whatever you normally use.
A quick pre-flight checklist
- Home line: on, data roaming off, set as the default line for calls and texts.
- Travel eSIM: installed, labelled clearly and switched off until you land.
- Cellular data switching: off.
- Banking and messaging apps: logged in once at home, with backup codes saved.
- Carrier roaming terms: checked for incoming calls, texts and any daily fee.
FAQ
Will I still receive bank verification texts abroad?
Yes, as long as your home line is turned on and has signal through your carrier's roaming partners. Check with your carrier whether incoming texts cost anything abroad.
Can I turn off my home line completely to avoid charges?
You can, but you won't receive texts or calls on it. Many travellers keep it on for verification codes, with data roaming switched off.
Do I need data roaming on my home line for iMessage?
No. iMessage and FaceTime use whatever data connection is active, including the travel eSIM, while still showing your home number.
What if the travel eSIM stops working?
Connect to Wi-Fi and follow our no-service checklist. Don't switch on data roaming on your home line as a quick fix unless you've checked your carrier's rates.
How do I set this up on iPhone?
Our iPhone setup guide walks through each screen, including the line labels and data settings.