You can usually turn off your primary SIM in phone settings and use your eSIM as the active line for mobile data while traveling.
Many travelers do this to avoid roaming charges and keep their travel setup simple.
Quick answer: Open SIM settings, disable the primary SIM line, then turn ON the eSIM and select it for mobile data.
Important: Settings names vary by phone model, software version, and dual SIM capabilities. Service behavior depends on your device and our General Conditions.
Why Travelers Turn Off the Primary SIM
- Avoid roaming charges
- Use only the travel eSIM data plan
- Reduce SIM confusion
- Save battery on some devices
- Keep one clear active line
Tip: Many travelers first try leaving the main SIM on with roaming disabled before fully turning it off.
How to Turn Off Primary SIM on iPhone
- Open Settings
- Tap Cellular or Mobile Data
- Select your primary SIM line
- Turn OFF Turn On This Line
- Return to Mobile Data settings
- Select the eSIM as Mobile Data line
Helpful guides:
How to Turn Off Primary SIM on Android
- Open Settings
- Go to SIM Manager, Connections, or Mobile Network
- Select your primary SIM
- Toggle the SIM OFF
- Select the eSIM for mobile data
Helpful guide: How to Set eSIM as Mobile Data on Android
What Happens When You Turn Off the Primary SIM?
- That line stops calls and SMS on the device
- Roaming charges from that line are reduced or avoided
- The eSIM becomes the main active connection
- Your regular number may be temporarily unavailable
Should I Turn It Fully Off?
Not always. Some travelers prefer to keep the primary SIM ON for calls or verification texts while using eSIM for data.
Can I Use My Normal Phone Number with eSIM?
What If I Still Have No Internet?
Check these settings:
- eSIM line is ON
- eSIM selected for mobile data
- Data roaming ON if required
- Airplane Mode OFF
- Destination supported
Helpful guides:
- Should Data Roaming Be On for eSIM?
- Why Is My eSIM Connected but No Data?
- How to Check If eSIM Is Using Data
What If I Need My Main SIM Again?
You can usually turn the primary SIM back ON anytime in settings.
How to Switch Back to Primary SIM After Trip
Best Travel Setup
- Install eSIM before departure
- Land and enable eSIM
- Turn off main SIM if desired
- Test maps, browser, and messaging
Why This Matters for Travelers
Many travelers accidentally roam because the primary SIM remains active for data.
Turning it off can create a cleaner and safer setup.
Need travel data now? Browse NoveSIM travel eSIM plans.
Premium Traveler Tip
If you need banking SMS codes, keep the primary SIM available instead of disabling it completely.
Final Thoughts
You can usually turn off your main SIM and use only eSIM while traveling.
Just make sure the eSIM is active and selected for mobile data first.
FAQ
How do I turn off my main SIM and use eSIM?
Open SIM settings, disable the primary SIM, and select the eSIM for mobile data.
Will I lose my normal number?
That line may become unavailable while turned off.
Can I turn the main SIM back on later?
Yes, usually anytime through settings.
Should I fully turn it off?
Not always. Some travelers keep it on for calls or SMS.
Why no internet after switching?
Usually because the eSIM is not selected for data or roaming settings need adjustment.
