Roaming
Data roaming on or off with an eSIM? Safe settings
Configure data roaming safely for a travel eSIM and stop your home SIM from using data unexpectedly. Includes precise settings for iPhone and Android.
In this guide
With a travel eSIM, data roaming should usually be on for the eSIM and off for your home SIM. The travel eSIM often connects through a partner network at your destination. Enabling roaming on that profile gives access to its data plan; disabling it on the home line prevents that line from using data abroad.
Safe default: keep the home SIM for calls and texts, select the travel eSIM for mobile data, enable data roaming only on the travel eSIM, and disable automatic cellular data switching.
Why does a travel eSIM need data roaming?
Technically, roaming means that a SIM profile uses a network other than its home network. This does not apply only to your domestic plan. A prepaid travel eSIM may also roam on a local partner network. The Data roaming switch therefore does not automatically mean that you will receive an expensive bill later.
The selected plan determines the charges, not the name of the switch. If the plan contains 5 GB for a destination, eligible usage comes from that allowance. Still confirm that the destination is covered and that the provider instructs you to enable roaming.
Read eSIM versus roaming for the difference between the underlying technology and the pricing model.
The safe setup for two SIM lines
Configure each line separately. Do not use one general on-or-off rule for the entire phone.
| Setting | Home SIM | Travel eSIM |
|---|---|---|
| Line enabled | On for reachability | On |
| Mobile data | Not selected | Selected |
| Data roaming | Off | On when the provider requires it |
| Calls and texts | Default line | Only if the plan includes them |
| Automatic data switching | Off | Off |
Apple confirms that an iPhone uses one cellular data network at a time. Google likewise lets eligible Pixel phones choose a preferred SIM for data, calls, and texts.
Automatic data switching requires special attention. When enabled, the phone may temporarily use the other line for data during weak coverage or a call. That can generate charges when the other line is outside its home allowance.
Configure data roaming on iPhone and Android
On iPhone, open Settings > Cellular or Mobile Data. Tap the home line first and disable data roaming. Go back, open the travel eSIM, and enable data roaming there. Under Cellular Data, select the travel eSIM and turn off Allow Cellular Data Switching.
On Google Pixel, open Settings > Network & internet > SIMs. Select the travel eSIM for mobile data and manage roaming for each profile. On Samsung, these controls are usually under Settings > Connections > SIM manager and Mobile networks. Menu names vary by Android version, manufacturer, and region.
Then test without Wi-Fi:
- Confirm that the travel eSIM is enabled.
- Temporarily turn off Wi-Fi.
- Open a website or maps app.
- Check which line supplies data in the status bar.
- Review usage per SIM and confirm that only the travel eSIM increases.
The full line configuration is covered in set up Dual SIM.
Inside the EU, the choice may be different
During temporary travel within the EU and EEA, you can usually use your home plan at domestic rates. You may not need a separate eSIM at all. Fair-use conditions and exceptions can still apply.
The European Commission says Roam Like at Home covers the EU plus Iceland, Liechtenstein, Norway, Ukraine, and Moldova. The United Kingdom, Switzerland, and Turkey are not automatically part of this statutory area, although carriers may include them voluntarily.
If you still use a travel eSIM inside the EU, keep the same safe setup. Do not select the home line for data, and disable automatic switching. This makes it clear which allowance is being used.
If the internet still does not work
Data roaming is only one requirement. Check in order whether the correct data line is selected, the profile is active, the destination is covered, the plan remains valid, and data is left. Then restart the radio connection with Airplane Mode.
If you see signal bars but pages do not load, follow no internet after eSIM installation. Do not delete the profile during testing; many QR codes cannot be used again.
Sources and editorial review
Dual SIM settings were checked against Apple and Google documentation. The current statutory roaming area was checked with the European Commission. Whether data roaming is required remains specific to the eSIM provider and plan. If instructions differ, follow those supplied with your eSIM. Last editorial review: July 26, 2026.
Frequently asked questions
Should data roaming be on for a travel eSIM?
Usually, yes. Many travel eSIMs use a partner network at the destination and need data roaming enabled on the eSIM profile. Enable it only for the travel eSIM, not the home SIM, and always check the setup instructions supplied with the plan you purchased.
Will enabling data roaming on the eSIM cost extra?
Not automatically. Usage follows the plan attached to the selected eSIM. Charges depend on its terms, such as top-ups or renewal, or on another line supplying data. The crucial checks are which SIM is selected for mobile data and whether automatic switching is disabled.
Can my home SIM stay on without using data?
Yes. Keep the line enabled for calls and texts, but turn off data roaming on that line and select the travel eSIM for mobile data. Disable automatic data switching. Calls and texts through your regular number may still generate roaming charges outside the EU.
Does data roaming need to be on inside the EU?
To use your home plan's data in another EU or EEA country, roaming normally needs to be enabled. Usage then falls under your domestic allowance and possible fair-use conditions. With a separate travel eSIM, manage roaming per line and follow that plan's instructions.
Why does my eSIM not work even though roaming is on?
The wrong data line may be selected, the plan may not be active, coverage may exclude your location, the plan may have expired, or its APN may be missing. Check the line, destination, validity, and remaining data first. Do not delete the eSIM before support reviews the settings.
