You can usually switch between your primary physical SIM and eSIM directly in your phone settings for mobile data, calls, and messaging.
This is one of the most useful features for travelers who want to keep their normal number active while using a travel eSIM for cheaper mobile data abroad.
Quick answer: Keep your main SIM for calls and SMS, then select your eSIM as the mobile data line.
Important: Available options depend on your phone model, software version, unlocked status, and our General Conditions.
Why Switch Between SIM and eSIM?
Many travelers use dual SIM mode to enjoy the best of both worlds:
- Keep your regular phone number active
- Use a travel eSIM for mobile data
- Avoid expensive roaming charges
- Receive calls or texts on your main line
- Use local or regional data while abroad
Best Travel Setup
- Primary SIM: calls, SMS, banking codes
- Travel eSIM: internet, maps, apps, browsing
This setup is common among frequent travelers.
How to Switch on iPhone
- Open Settings
- Tap Cellular or Mobile Data
- Select Mobile Data
- Choose your eSIM
- Choose default voice line if needed
Helpful guide: How to Install eSIM on iPhone
How to Switch on Android
- Open Settings
- Go to SIM Manager, Connections, or Mobile Network
- Select Mobile Data
- Choose your eSIM
- Set calls/SMS preferences if available
Helpful guide: How to Set eSIM as Mobile Data on Android
How to Use Main SIM for Calls and eSIM for Data
This is often the best travel combination.
- Leave primary SIM active
- Select eSIM as mobile data line
- Keep main SIM as default voice line
- Disable roaming on primary SIM if desired
- Enable roaming on eSIM if required
Helpful guide: Should Data Roaming Be On for eSIM?
Tip: Turning OFF data roaming on your home SIM can help avoid unexpected carrier charges.
How to Switch Back to Your Main SIM
When returning home:
- Open SIM settings
- Select primary SIM for mobile data again
- Turn off travel eSIM if desired
- Keep eSIM installed for future trips if reusable
Can I Use Both at the Same Time?
Often yes. Many modern phones support:
- Primary SIM for calls
- eSIM for mobile data
- Incoming calls on main number
- Messaging apps using data line
Common Problems When Switching
1. eSIM Has Signal but No Data
The wrong line may still be selected.
Why Is My eSIM Connected but No Data?
2. No Service on eSIM
Check roaming, supported country, and line status.
Why Does My eSIM Say No Service?
3. Main Number Not Receiving Calls
Check whether the physical SIM is still enabled.
4. Battery Drain
Using two active lines may increase battery use slightly.
Should I Remove My Physical SIM?
Usually no. Keeping it active is useful for OTP codes, calls, and account access.
Why This Matters for Travelers
Knowing how to switch correctly can save money, avoid roaming fees, and keep your main number reachable abroad.
It is one of the most powerful advantages of using eSIM technology.
Need travel data now? Browse NoveSIM travel eSIM plans.
Final Thoughts
The smartest travel setup is often: main SIM for calls, eSIM for data.
Most phones let you switch between them anytime in settings.
FAQ
Can I use my primary SIM and eSIM together?
Many modern phones support using both at the same time.
What is the best travel setup?
Main SIM for calls and SMS, travel eSIM for data.
Do I need to remove my physical SIM?
No, usually you can keep it installed and active.
How do I switch back after travel?
Select your primary SIM as the mobile data line again in settings.
Can this help avoid roaming fees?
Yes, using an eSIM for data often helps reduce roaming costs.
