A data-only eSIM gives your phone mobile internet. It does not include ordinary carrier calls, SMS or a usable local phone number unless the plan explicitly says otherwise. You can use internet calling and messaging apps over its data connection, subject to the app and local network being available.
That distinction matters when booking a restaurant, receiving a bank code or keeping in touch with family. Before buying, decide whether you need internet access, a telephone number, or both.
What works with a data-only eSIM?
| Task | What you need |
|---|---|
| Maps, email, ride booking and web browsing | Mobile data and access to the relevant app or website |
| Calls inside a messaging app | A working app account, data and an available calling service |
| Call a restaurant's ordinary phone number | A voice-enabled line or an internet calling service that supports telephone numbers |
| Receive a bank's SMS code on your home number | Your home line must remain able to receive SMS; the travel data allowance does not replace it |
| Receive SMS on a new local number | A plan that explicitly includes that number and SMS service |
Do not assume a number shown in your phone's SIM settings is a usable calling number. Check the purchased plan's listed services. A product described as data-only should be treated as internet access, even if your phone displays a number for the profile.
Can you keep your existing number?
Adding travel data does not require transferring your existing number. On a compatible dual-SIM phone, you can keep your home line and select the travel line for mobile data. Your home carrier still controls calls, texts, roaming eligibility and charges on the home number.
Apple describes using a travel eSIM alongside a home line and warns that keeping both active can still incur home-line roaming fees. See Apple's international eSIM guide. For the settings, use our dual-SIM travel setup guide.
If you turn the home line off, plan how you will sign in to important accounts without SMS. Set up an authenticator or another supported recovery method before departure. Do not assume a data-only plan can receive verification texts intended for your home number.
App calls and carrier calls are different
A call made inside an internet messaging app uses an internet connection. A call placed through the phone's ordinary dialer may use your selected voice line and its tariff. Check which service you are using before calling a hotel or a local business.
App-to-app calling usually requires the other person to use that service too. Calling an ordinary telephone number through an internet service can require a separate paid allowance. Network restrictions can also affect calling apps, so check your destination rather than treating data coverage as a guarantee that every app works.
For budgeting, read our WhatsApp data guide and trip-data planning guide. Video calls and media uploads can consume much more data than text conversations.
Which plan should you choose?
- Mostly maps, bookings and messages: a data-only plan can cover those tasks if the services you use are available at your destination.
- Frequent ordinary phone calls: compare a voice-enabled local plan, your carrier's travel options and a separate internet calling service.
- Bank codes on your existing number: confirm SMS roaming and costs with your home carrier before departure.
- Remote work: check hotspot permission, data allowance, fair-use terms and a backup connection. A data plan does not guarantee a particular meeting quality.
Start with your phone's eSIM compatibility, then compare destination plans. Check coverage, validity, activation rules and included services on the specific plan you choose.
If you are new to Wanderly, you can also check the free eSIM trial in the app. Availability, allowance and validity depend on your destination and eligibility. It requires no credit card and does not renew into a subscription.