How to Install and Activate a Vietnam eSIM Without Losing Your Home SIM
Yes—on a compatible, unlocked phone, you can usually add a travel eSIM and keep your home SIM installed. Install the travel profile while you have an internet connection, leave the home line on for calls or messages if your home plan supports them, set the travel line as mobile-data default, and disable automatic data switching until you verify the settings. Menu names vary by model, region, carrier, and OS.
Before you install
Check these four conditions before scanning a QR code or accepting an activation link:
- eSIM support: Confirm the exact phone model and regional variant supports eSIM. A phone can support eSIM in one market but not another.
- Carrier unlock: If you will use two different carriers, check that the phone is unlocked. On iPhone, Settings > General > About > Carrier Lock should show No SIM Restrictions. Ask the home carrier how to check an Android device.