Dual SIM with an eSIM: using two numbers at once
One of the biggest advantages of an eSIM is dual SIM: your phone uses your home SIM card and an eSIM at the same time. This way you keep your familiar number active while you enjoy affordable local data when travelling. This guide explains how it works and how to set it up properly.
Changing phones? Check the eSIM transfer guide for new phones so both your lines survive the move.
What is dual SIM?
A device with eSIM can manage two lines at the same time: your physical home SIM card and an eSIM. Both exist side by side. In practice, you receive calls and texts on your home number, while you use the eSIM for internet. Ideal when travelling: you stay reachable without paying roaming for data.
Setting up your two lines properly
| Setting | Recommended choice |
|---|---|
| Default data line | The eSIM |
| Calls and texts | Your home number |
| Data from your home SIM (outside EU) | Off |
| Data roaming for the eSIM | On |
Outside the EU: turn off the data on your home SIM card, otherwise an app running in the background can use up expensive roaming. You do stay reachable for calls and banking codes.
For setting it up the first time, our guide activating an eSIM helps.
Why it is so convenient
Dual SIM solves the classic travel dilemma: switching off your phone out of fear of the bill, or paying expensive roaming. With an eSIM added, you keep your number for what matters and use local data at a fixed price. Especially outside the EU this saves a lot, as we explain in eSIM or roaming.
Which devices support dual SIM with eSIM?
Most recent devices do. iPhones from the XS onwards, and many models from Samsung Galaxy, Google Pixel and other brands manage a physical SIM card and an eSIM at the same time. Older or budget devices do not always. Check your device via phones with eSIM.
Frequently asked questions
Does my home number stay reachable?
Yes. You receive calls and texts on your home number while the eSIM handles your data.
Do I pay roaming on my home line?
Not for data if you turn it off. For incoming calls, the normal terms of your contract apply.
Does dual SIM work on every device?
On most recent devices it does, but not always on older or budget ones. Check your device in advance.
Conclusion
Dual SIM is one of the biggest strengths of the eSIM: you keep your home number for calls and codes, and use an eSIM for affordable data. Set up properly, you are reachable and connected everywhere, without surprises. At esimzu you receive your eSIM instantly by email, with customer support.