Dual Vietnam eSIMs on same phone: possible? recommended?
Most modern smartphones let you install and activate two eSIMs at the same time — so yes, running two Vietnam eSIMs on one phone is technically possible. But is it worth doing? For most travelers, one eSIM is simpler and cheaper. A concrete scenario where two might help: keeping a local Vietnamese number for receiving Grab driver calls or banking OTPs on one eSIM while using a separate data plan on the other for everyday internet.
Which phones support two eSIMs?
Apple iPhones from iPhone XS onward (excluding mainland China, Hong Kong, and Macau models) support two active eSIMs on iOS 12.1 and later. That covers iPhone XS, XR, 11, 12, 13, 14, 15, and 16 series — all allow dual eSIM without needing a physical SIM card.
On the Android side, Samsung Galaxy S20+, S21+, S22+, S23 series, Note20, and Fold/Flip models (most variants) support dual eSIM via Dual SIM Dual Standby (DSDS). Google Pixel 3 and later, including Pixel 7, 8, and 9, also handle dual eSIM. Note: Mainland Chinese iPhones have no eSIM at all; Hong Kong and Macau models have only a single eSIM slot. Some Android devices limit dual eSIM to one eSIM plus one physical SIM — to verify, check Settings > Connections > SIM card manager on your Samsung.
Installing two Vietnam eSIMs — step by step
Two Vietnam eSIMs (for example, one from Viettel and one from Vinaphone) can be installed on any device that supports dual eSIM. Each eSIM comes as a separate profile with its own QR code — you simply scan the codes one after another during setup.
After installation, label each line clearly in Settings > Cellular (iPhone) or Connections > SIM card manager (Samsung) — something like “Viettel Data” and “Vinaphone Voice”. Both eSIMs will appear in the SIM list, and you can assign one for data, the other for voice/SMS, or keep both active in DSDS mode. The eSIMs we sell — Viettel and Vinaphone — both work in DSDS on supported devices, so you can run them side by side without issues.
When you might actually want two Vietnam eSIMs
Coverage redundancy is the top reason. Viettel has the strongest rural and remote coverage in Vietnam, while Vinaphone performs very well in cities. Having both means you are unlikely to lose connectivity even when traveling through mountainous areas or small villages. Another scenario is keeping a separate voice line — for example, a Vinaphone eSIM with a local number that Grab drivers or hotels can call back, while a data-heavy Viettel eSIM handles all your internet.
Digital nomads and long-term travelers might use one eSIM for work and another for personal data, though that’s rare. Some Vietnamese residents need a specific carrier like Vinaphone for banking SMS while using Viettel for general data. That said, for 99% of tourists, a single eSIM (7 to 30 days, 5 GB/day) is plenty — two eSIMs are overkill unless you have a concrete use case like the ones above.
How to set up a dual eSIM combo
Step 1: Confirm your phone is unlocked and supports dual eSIM (check section 1 above). Step 2: Purchase two Vietnam eSIMs — for instance, a Viettel 7-day and a Vinaphone 10-day — from simvietnam.telebox.vn. Step 3: Scan or install both QR codes before departure (you need internet to download the profiles). We recommend doing this while still on Wi-Fi at home or in the airport.
Step 4: In Settings > Cellular (iPhone) or Connections > SIM card manager (Samsung), assign one line as your default for data, and the other for voice/SMS. Step 5: Test both lines by sending a test SMS or browsing — if one fails, toggle it off and on, or check APN settings. Step 6: Enable data roaming on the line you’ll use for data; keep roaming off on the voice line to avoid accidental data charges.
Trade-offs and limitations of running two eSIMs
Dual eSIM draws slightly more battery because DSDS keeps both radios ready for incoming calls — but the difference is minor for a day’s use. More importantly, only one data line can be active at a time. If the primary data eSIM loses signal, the phone will not automatically switch to the second eSIM’s data — you have to manually change the data line in settings.
Data allowances on the two eSIMs are independent; unused data on one does not carry over to the other. Voice calls on one line may cause a brief data pause on the other (a DSDS limitation). Also, if you use a Vinaphone eSIM for its local number to receive OTPs from Grab or banking apps, make sure that line stays active and has at least minimal signal. Planning which eSIM carries the voice number is essential.
Should you buy two Vietnam eSIMs? (Our recommendation)
For 99% of tourists, we recommend buying a single Vietnam eSIM — choose either Viettel or Vinaphone with enough data (5 GB/day) to cover your trip. It is simpler, cheaper, and avoids the hassle of managing two lines. Get two only if you genuinely need coverage in remote areas (choose Viettel for rural strength) or if you must have a separate local voice number alongside a data plan.
If you do decide on two, the best pairing is Viettel for data (strongest overall coverage) and Vinaphone for voice (since our Vinaphone eSIMs include a phone number that can receive incoming calls and SMS — though not outgoing calls). For a two-week trip, a Viettel 7-day ($9.9) plus a Vinaphone 10-day ($11.9) works well. Most travelers will find one eSIM perfectly sufficient.
FAQ
Can I have two eSIMs from the same carrier?
Yes, but there’s little benefit. Two eSIMs from the same carrier share the same network, so you gain no coverage redundancy. Each will have its own data allowance, but you still cannot combine them. It’s more practical to pick one carrier with enough data for your trip.
Will two eSIMs drain my battery faster?
Dual eSIM (DSDS) does use slightly more battery because both radios are active to listen for calls and texts. However, the difference is not drastic — you might notice a modest drop compared to using a single eSIM, but it won’t ruin your day if you carry a power bank for heavy use.
Can I receive OTP SMS on both eSIMs?
Yes — with dual eSIM, both lines can receive SMS simultaneously. This is useful if you need SMS from services like Grab or Vietnamese banking apps on your local Vinaphone number while also having a data eSIM. Just ensure the line expecting SMS is set to receive them (both can by default).
Does dual eSIM work with iPhone 16 and Samsung Galaxy S24?
Yes. iPhone 16 (non‑China models) supports dual eSIM natively, and Samsung Galaxy S24 series supports dual eSIM via DSDS. Both can run two Vietnam eSIMs side by side. As always, check that your specific variant is not from a region that restricts eSIM (e.g., mainland China iPhones).
What happens if I run out of data on one but have data on the other?
Data allowances are separate. If you run out of data on the eSIM set as your default data line, the phone will not automatically switch to the second eSIM’s data. You must manually go into settings and change the data line to the other eSIM. You cannot merge or pool the two allowances.