A clear, device-by-device guide to enable Data Roaming for your travel eSIM, set up dual-SIM correctly, troubleshoot connection issues, and buy NexaEsim plans.
How to turn on data roaming for travel eSIM: enable Mobile Data for the eSIM profile and switch Data Roaming ON for that line so your prepaid NexaEsim plan can connect to local networks abroad.
Quick Answer
On iPhone: Settings > Cellular > select your eSIM > Cellular Data Options > toggle Data Roaming ON and set the eSIM as your Mobile Data line. On Android (stock/Pixel): Settings > Network & Internet > Mobile network > choose the eSIM > turn on Mobile data and Data roaming. For Samsung One UI: Settings > Connections > Mobile networks > SIM card manager / Mobile data > enable Data roaming for the eSIM. If you have a home SIM, keep its roaming OFF to avoid carrier charges.
Before you go — quick checklist
Buy & install your NexaEsim plan
Purchase a prepaid plan that covers your destination on NexaEsim and install the eSIM before travel. Browse plans: See eSIM plans for 200+ countries. Follow the installation guide if you need help: NexaEsim installation guide.
Verify the eSIM profile is active on your device
- Open Settings > Cellular / Network & Internet > Mobile network and confirm the eSIM profile is listed and shows as active.
- Label the eSIM (e.g., "Travel") so you can identify it when changing data settings.
Back up home SIM info & set a travel contact
Note your home carrier details, IMEI, and emergency contact. If you plan to keep your home SIM inserted, disable its mobile data and roaming before departure.
Step-by-step: iPhone (iOS 16–18)
Single SIM / single eSIM setup
- Open Settings > Cellular.
- Select the eSIM profile (tap the label you created).
- Tap Cellular Data and set the eSIM as the default data line if needed.
- Go to Cellular Data Options > toggle Data Roaming ON.
- Return, confirm Mobile Data is enabled for the eSIM.
Dual SIM / eSIM + physical SIM — which line to use for data
- If you want to use the travel eSIM for internet, set the eSIM as your Mobile Data line in Settings > Cellular > Default Voice Line / Cellular Data.
- Keep your home SIM for calls/texts if desired but ensure its Data Roaming is OFF to prevent roaming charges.
Screenshots & short video demo
Collect screenshots of Settings > Cellular > Cellular Data Options on iPhone (iOS 16–18). A short 60–90s demo of toggling Data Roaming is ideal for quick reference.
What to do if Data Roaming option is greyed out
- Confirm the eSIM profile is active and installed correctly.
- Restart your iPhone; ensure the device is carrier-unlocked.
- If still greyed out, remove and reinstall the eSIM using the QR or manual code from NexaEsim.
Step-by-step: Android (Stock/Pixel)
Common menu names
Menu paths vary slightly by Android version. Typical: Settings > Network & Internet > Mobile network > (select SIM/eSIM).
Toggle Mobile Data + Data Roaming for the eSIM profile
- Open Settings > Network & Internet > Mobile network.
- Select your eSIM profile (it may say SIM 2 or the label you set).
- Turn on Mobile data and Data roaming.
- If needed, set the eSIM as the default data SIM in the SIMs or Default SIM section.
Pixel examples
Pixel phones use the Stock Android labels above. If roaming doesn't connect, try manual network selection: Settings > Network & Internet > Mobile network > Network operators > Search networks > choose the listed local MNO.
Step-by-step: Samsung (One UI) & other OEM quirks
Samsung One UI differences
- Path: Settings > Connections > Mobile networks > SIM card manager. Select the eSIM and enable Data roaming. Also set the eSIM as Mobile data in SIM card manager.
- One UI sometimes groups roaming and data settings—ensure the correct SIM is selected before toggling.
Xiaomi / Oppo / OnePlus notes
Menu labels can be: Settings > SIM cards & mobile networks or Settings > Mobile network. Look for Mobile data, Data roaming, and Preferred network.
Dual‑SIM decision matrix
| Scenario | Home SIM | Travel eSIM |
|---|---|---|
| Keep home SIM inserted for calls/texts | Mobile Data OFF, Roaming OFF | Mobile Data ON, Roaming ON (default data) |
| Use only eSIM (remove home SIM) | — | Mobile Data ON, Roaming ON |
| Use home carrier for calls & eSIM for data | Voice/SMS ON, Data Roaming OFF | Mobile Data ON, Roaming ON |
How to switch default data line when already abroad
- Open Settings > Cellular / SIMs & mobile networks.
- Choose Default data and select your eSIM profile.
- Then enable Data roaming for that profile.
Troubleshooting — common problems and fixes
No internet after turning roaming on
- Toggle Airplane mode ON for 10 seconds, then OFF.
- Restart your device.
- Manually select a local network: Settings > Mobile networks > Network operators.
“No service” or “SOS only” messages
Confirm the eSIM is active; check the device is unlocked; try reinstalling the eSIM profile or contact NexaEsim support if the profile never registered.
APN settings and carrier profile checks
Most NexaEsim plans provision APN automatically. If you see signal but no data, verify or reset APN: Settings > Mobile network > Access Point Names > reset to default or add the APN provided in your NexaEsim install instructions.
Device-specific fixes
- iPhone eSIM stuck? Remove the eSIM profile and reinstall from your NexaEsim QR/manual code.
- Android APN errors? Reset network settings (Settings > System > Reset options > Reset Wi‑Fi, mobile & Bluetooth).
When to contact NexaEsim vs device manufacturer vs local carrier
Contact NexaEsim first for plan, activation, or QR reinstall issues. Contact device OEM for hardware or SIM lock problems. Contact local carrier only if the phone connects to their network but data still fails after APN checks.
Costs, billing, and safety
Why you must turn on Data Roaming for travel eSIMs
Prepaid travel eSIMs connect to local partner networks; Data Roaming enables your device to use those partner services. Your NexaEsim usage is deducted from the prepaid plan—no surprise post-trip roaming bill from the travel eSIM.
Avoiding unexpected charges
Turn OFF Data Roaming on your home SIM and keep mobile data off for that line. That prevents your home carrier from charging you roaming fees while your eSIM handles data.
Using a VPN / public Wi‑Fi safety
Use a VPN on public Wi‑Fi for privacy. Mobile data from an eSIM is as secure as other mobile networks, but a VPN adds extra protection.
After you return — switch back safely
Turning home carrier data/roaming back ON/OFF
- Go to Settings > Cellular / SIMs and set your home SIM as the default data line if you want to resume home data.
- Turn Data Roaming OFF for the travel eSIM if you plan to keep it installed.
Removing or keeping eSIM profiles
You can keep the eSIM for future trips or remove it: Settings > Cellular / Mobile network > select the eSIM profile > Remove/Delete.
NexaEsim support & buy path
Ready to buy? Browse plans and coverage: See NexaEsim plans. Check device compatibility: Compatible devices. Need install help? Follow the step-by-step guide: Installation guide. For updates and tips, visit our Blog.
FAQ
Do I have to turn on Data Roaming to use my travel eSIM?
Yes. Enable Mobile Data for the travel eSIM and toggle Data Roaming ON for that profile so it can connect to local partner networks.
Will turning on Data Roaming charge me extra?
For prepaid NexaEsim plans, usage is taken from your plan allowance—there are no extra roaming fees from NexaEsim. Turn off roaming on your home SIM to avoid charges from your primary carrier.
Which SIM should have Data Roaming ON in a dual‑SIM phone?
Set Data Roaming ON for the travel eSIM (the data line) and OFF for your home/primary SIM to prevent your home carrier charging roaming fees.
Data Roaming is greyed out — what now?
Restart the device, confirm the eSIM is active, make sure the phone is unlocked, and remove/reinstall the eSIM profile if needed. Contact NexaEsim support if problems persist.
My eSIM shows signal but no internet — why?
Check that Mobile Data and Data Roaming are ON for the eSIM, try manual network selection, reset APN to defaults, or restart your phone. If the issue remains, contact NexaEsim support.
Editorial note / Byline
Written by the NexaEsim Support Team. Updated May 2026. This article explains device settings and general eSIM guidance; for device-specific firmware changes see your phone manufacturer support pages.
