When traveling abroad, many people use a travel eSIM for mobile data while keeping their primary SIM active for calls and messages.
Knowing how to switch between your eSIM and physical SIM correctly ensures you avoid roaming charges and always stay connected.
This guide explains:
- How switching between SIMs works
- How to change your data line in seconds
- The safest setup for travelers.
Why travelers switch between eSIM and physical SIM
Using the right SIM for the right purpose helps you:
- Avoid expensive roaming fees
- Keep your home number active
- Use local or travel data plans efficiently
- Switch networks instantly when needed
Most travelers set:
- Primary SIM → Calls & SMS
- Travel eSIM → Mobile data
How to switch SIMs for mobile data (iPhone)
- 1. Open Settings → Mobile Data (Cellular)
- 2. Tap Mobile Data
- 3. Select your eSIM or Primary SIM
- 4. Confirm the change
The switch usually takes only a few seconds.
How to switch SIMs for mobile data (Android / Samsung)
- 1. Open Settings → Connections → SIM manager
- 2. Tap Mobile data
- 3. Select the SIM you want to use
- 4. Confirm
Signal will reconnect automatically.
When should you switch back to your primary SIM?
You may want to switch back when:
- Returning to your home country
- Needing carrier-specific services
- Testing connectivity issues
- Temporarily disabling the travel plan
Switching does not delete your eSIM — it only changes which SIM provides data.
Best recommended travel setup
For most international trips:
- Keep Primary SIM active for calls/SMS
- Set Mobile Data = Travel eSIM
- Turn Data Roaming OFF on the primary SIM
- Turn Data Roaming ON for the travel eSIM (if required)
This prevents unexpected roaming costs while keeping your main number reachable.
Internal travel tip
- If you haven’t installed your travel eSIM yet, follow the installation guide here: How to Install an eSIM on Samsung Phones (Step-by-Step)
- To understand how Dual SIM works, read: Can I Use eSIM and Physical SIM Together? (Dual SIM Explained)
- Check compatible devices here: Which Phones Support eSIM in 2026?
- Browse travel plans: https://novesim.com/destinations/
Common mistakes when switching SIMs
- Mobile data still using the wrong SIM → Always confirm which line is selected under Mobile Data.
- Data roaming enabled on the primary SIM → Turn it off to avoid roaming charges.
- SIM temporarily losing signal → This is normal during switching and usually resolves within seconds.
Frequently asked questions
Is switching between eSIM and physical SIM instant?
Yes. Switching usually takes a few seconds while the phone reconnects to the selected network.
Will switching SIMs delete my eSIM?
No. The eSIM stays installed. Switching only changes which line provides mobile data.
Can I switch SIMs multiple times per day?
Yes. There is no limit, and many travelers switch depending on location or connectivity.
Should I remove my physical SIM when using eSIM?
Not necessary. Keeping it installed allows you to receive calls and SMS on your main number.