Can I continue using main SIM while using eSIM from Twise?

Using main SIM while using eSIM is one of the most convenient ways to stay connected while traveling. If you’ve ever wanted to keep your local number active for calls and SMS while using affordable data abroad, this setup is exactly what you need.

With Dual SIM phones, you can easily continue using your main SIM while using a Twise eSIM for data — meaning no missed calls, no switching SIM cards, and no overpriced roaming fees.

Can I Continue Using Main SIM While Using eSIM?

Yes — you can absolutely use your main SIM while using eSIM as long as your phone supports Dual SIM technology. Modern smartphones like newer iPhones, Samsung Galaxy models, and Google Pixel devices allow a physical SIM and an eSIM to function together.

This setup is ideal for:

• Travelers who need affordable data abroad
• Remote workers needing two active lines
• Anyone who relies on banking OTPs or local calls
• Digital nomads who swap data plans frequently

What You Need to Know About Dual SIM + eSIM

Most modern smartphones — like recent iPhones, Samsung Galaxy devices, and Google Pixels — support Dual SIM Dual Standby (DSDS). This means your phone can run two active lines at the same time:

• Your main SIM stays active for calls, SMS, and authentication codes.
• Your Twise eSIM provides fast, affordable mobile data while abroad.

This allows you to avoid expensive roaming charges without losing connection to your regular number.

How to Use Your Main SIM and Twise eSIM Together

Here’s a simple step-by-step to get using main SIM while using eSIM works smoothly:

• Check Device Compatibility

To use your main SIM while using eSIM, your device must support Dual SIM + eSIM. Most iPhone XR and later, Samsung S20 and newer, and Google Pixel 3 and up models do.

• Activate Both Plans

• • Insert your physical SIM as usual.
  • Add your Twise eSIM by scanning the QR code provided after purchase.

Your phone will display both lines, usually labeled as “Primary” and “Secondary” (you can rename them in Settings).

• Assign a Line for Mobile Data

Go to Settings → Mobile/Cellular → Mobile Data.

Choose Twise eSIM as your data line to use local data abroad at cheaper rates than roaming.

• Assign a Line for Calls and SMS

Select your main SIM as the default for calls and texts so you can receive OTPs, bank messages, or keep in touch with family and friends without switching numbers.

• Manage Settings Anytime

You can switch between data lines or change your default calling line in just a few taps. Some devices even let you choose which SIM to use per contact.

Read more:

How do I get an eSIM?

Affordable eSIM Phones in 2025: Compare the Best Budget Options

Benefits of Using Main SIM while using eSIM from Twise

Using both SIMs simultaneously comes with several advantages, especially for travelers and digital nomads:

• Stay Connected While Traveling

Keep your main number active for important calls while using Twise eSIM for local high-speed data abroad. No need to swap SIMs or miss critical messages.

• Separate Work and Personal Lines

Assign your business line to one SIM and personal line to another. This is perfect for entrepreneurs or remote workers managing multiple roles.

• Maintain a Backup Number

You can keep your physical SIM online for essential services (e.g., receiving OTPs) while relying on Twise eSIM for all data usage — giving you flexibility and security.

A Few Things to Keep in Mind

Before you jet off, here are some quick considerations:

• Only one data connection at a time: Dual SIM phones typically use data from one line at once. You can switch lines in Settings if needed.
• Battery usage: Running two SIMs may slightly increase battery drain, but most modern phones handle this well.
• Carrier charges: Your home network might still charge for calls and SMS on your main line while abroad. Check your plan to avoid surprises.

Twise Travel Tips – Real-Life Scenario

When going abroad, travelers can keep their physical SIM active for banking OTPs while using Twise eSIM for unlimited local data. They set their Twise line as the primary data SIM, which let them use Google Maps, translate apps, and ride-hailing services smoothly – without touching expensive roaming data.

Twise Tip:
Before your trip, set Twise eSIM as your data line and keep your main SIM for calls & SMS. This setup ensures seamless connectivity without switching cards or losing access to essential services.

Final Thoughts

So yes — using main SIM while using eSIM is not only possible, but it’s also one of the smartest ways to travel. With a Twise eSIM, you get fast local data while keeping your primary number active for calls and texts. Just ensure your phone supports Dual SIM, activate both plans, and choose the right settings.

Stay connected, avoid roaming fees, and enjoy seamless travel with Twise eSIM.