Fold/Flip Vietnam eSIM: Dual-SIM Setup for Foldable Phones

Foldable phones often have dual physical SIM slots — for example, the Galaxy Z Fold5 and Fold6 can hold two nano-SIMs simultaneously. Adding an eSIM gives you a third line, which is especially useful when traveling: you can keep your home physical SIM for calls and SMS while using a Vietnam data eSIM for internet access.

However, the folding mechanism can occasionally cause intermittent eSIM detection after opening or closing the device. This is rare and mostly reported on early versions of One UI, but it's something to be aware of. To avoid QR scanning alignment issues, install the eSIM profile with the screen fully unfolded — scanning in folded mode may misalign the camera with the QR code. Most foldables from Samsung, Oppo, and Google support eSIM, but you should always check IMEI-based compatibility by going to Settings > About Phone > eSIM.

Samsung's Galaxy Z Fold4/5/6 and Z Flip4/5/6 fully support eSIM alongside a physical SIM. The Galaxy Z Fold3 gained eSIM support via the One UI 4.1 update, but you should confirm your specific model has the eSIM chip by checking the IMEI. Google's Pixel Fold also works with both eSIM and a physical SIM, and we've seen it connect reliably to Viettel and Vinaphone networks.

Oppo Find N2 and N3 Flip support eSIM on global models, but Chinese variants may lack the eSIM hardware. Do not assume mainland China foldables like the Huawei Mate X3 support eSIM — most do not have the required chip. If you have a device from a Chinese brand, verify eSIM capability before purchasing a data plan.

First, purchase a Vietnam eSIM plan from simvietnam.telebox.vn — you will receive a QR code via email. On your foldable phone, go to Settings > Connections > SIM card manager > Add eSIM (the exact menu name may vary by brand). Unfold the phone completely before scanning the QR code to avoid alignment issues, then follow the on-screen prompts.

After installation, label the eSIM (e.g., 'Vietnam Data') and set it as the default for mobile data. Keep your home SIM as the default for calls and SMS. Reboot the phone once to ensure the eSIM profile is recognized correctly. If the QR code fails to scan, you can manually enter the SM-DP+ address and activation code provided in the email.

Set your primary data SIM to the Vietnam eSIM — no need to swap physical SIMs. For calls, keep your home SIM as the default. When you receive a call, data on the eSIM may pause because most foldables use dual SIM dual standby (DSDS). On Galaxy Z Fold devices, you can enable 'Auto data switching' to seamlessly switch between SIMs if one signal drops, but this is optional.

Note that Wi-Fi calling on your home SIM will not work over the Vietnam eSIM data connection on many foldables; test this before relying on it. If you need to share your Vietnam data connection via hotspot, you can enable it from the eSIM — there is no extra charge.

If the eSIM is not recognized after folding, go to the SIM card manager and toggle the eSIM off and on. If the problem persists, reinstall the profile. For QR code scanning failures, unfold the phone fully, clean the screen, and try scanning in landscape orientation. If the eSIM disappears after a software update, reinstall using the original QR or activation code — keep a screenshot of the QR for this purpose.

If you see a 'No SIM card' error on the eSIM while the physical SIM works, contact simvietnam support for a new QR. On Samsung Galaxy Z Flip devices, some users report that the eSIM slot is not enabled in Dual SIM settings; make sure you have updated to the latest One UI version.