Data-only eSIM vs eSIM with number: Which do you need?
A Vietnamese phone number sounds useful, but about 90% of visitors never actually need one. Data-only eSIMs provide internet access without a local number, while eSIMs with a Vietnamese number include a 10-digit line for calls and SMS. At simvietnam.telebox.vn, we sell data-only eSIMs because that’s what most travelers actually need — but we’ll explain both options honestly so you can choose the right one for your trip.
What are the two options?
A data-only eSIM gives you internet connectivity only — no local phone number, no ability to make or receive traditional calls or SMS. It’s installed via a QR code, works instantly, and doesn’t require a physical SIM card. Our plans (e.g., Viettel 7 days for $9.9, Vinaphone 10 days for $11.9) are all data-only. They are cheap, instant, and compatible with dual-SIM phones (you keep your home number active).
An eSIM with a Vietnamese number includes a local 10-digit number for calls and SMS. These are typically sold as physical SIM cards at airports or by other eSIM resellers, and often require passport registration. They cost more — usually $15–25 for 7 days — and activation can take minutes to hours. The quick answer is that over 90% of travelers only need data. A local number becomes necessary only for specific tasks: Vietnamese banking, some ride-hailing two-factor authentication, or making/receiving calls to local landlines without VoIP.
When you actually need a local number
Vietnamese bank accounts and e-wallets (MoMo, ZaloPay) require a local number for OTP SMS verification. However, tourists rarely need these services — most use international cards or cash. If you plan to open a local bank account (e.g., for long-term stays), a local number is mandatory.
Ride-hailing apps like Grab, Gojek, and Be accept foreign numbers for registration. Some promotions or payment methods (e.g., GrabPay top-up via local bank transfer) may request a local number, but for the typical tourist ordering a ride or food delivery, a foreign number works fine. Calling local businesses — hotels, restaurants — can be done via VoIP apps (Zalo, WhatsApp, Skype) if the establishment uses them. Some older places only answer voice calls; in that case, a data-only eSIM with a VoIP app (like Skype credit) can still make calls to landlines. Receiving SMS from Vietnamese services (booking confirmations, alerts) is rare for tourists because most services send confirmations via email or app notification.
When data-only is enough
Maps and navigation (Google Maps, Waze) work entirely over data. Social media and messaging apps (Facebook, Instagram, LINE, KakaoTalk, WeChat, WhatsApp, Zalo) only need data for texts, voice calls, and video calls. Video streaming (YouTube, Netflix), video calls (Zoom, FaceTime), email, browsing, and translation apps — all data-only. None require a local phone number.
A typical 1–2 week tourist needs maps, translation, messaging, and occasional video calls. A data-only eSIM covers all of that. Our 7-day Viettel plan is $9.9, while a comparable plan with a Vietnamese number usually costs $15 or more. For short trips, data-only is the clear money-saver and hassle-free choice.
Cost and convenience: comparison
Data-only eSIMs (like ours) start from $9.9 for 7 days (Viettel 5GB/day). Delivery is instant via QR code — no passport, no registration. You can keep your home number active for incoming calls and SMS on your physical SIM. Dual-SIM phones work seamlessly.
An eSIM with a Vietnamese number typically costs $15–25 for 7 days. It may require a passport scan at the airport or during online purchase. Activation can take minutes to hours, and some plans are only available as physical SIMs that need to be shipped. The convenience winner is clearly data-only: no registration, immediate use. The number winner is necessary only if you need local SMS or calls, or if you’re staying long enough to require bank accounts.
How to decide: simple guide
Ask yourself: Do you need to receive SMS from Vietnamese services (bank, ride-hailing 2FA)? If yes, get a plan with a local number. If no, data-only is fine. Will you call local phone numbers frequently? Consider a VoIP app (Zalo, Skype) with data-only, or get a number for cheap voice calls if you’ll be calling landlines often.
Staying longer than 30 days or working remotely with a Vietnamese bank account? You’ll likely need a local number. But for a simple 1-2 week tourist trip, a data-only eSIM is the best choice — cheaper, faster, no hassle. You can always buy a local number later if needed (some shops sell prepaid SIMs without long commitment).
FAQ
Can I receive SMS on a data-only eSIM?
No, a data-only eSIM provides only internet access. It does not include a phone number, so you cannot receive SMS. If you expect SMS verification codes or alerts from Vietnamese services, you’ll need a plan with a local number.
Do I need a Vietnamese number for Grab?
No, Grab accepts foreign phone numbers for registration and booking. Some users report that certain promotions or GrabPay top-ups via local bank transfer may require a local number, but for standard ride-hailing and food delivery, a foreign number works without issues.
How can I make local calls without a Vietnamese number?
Use VoIP apps like Zalo, WhatsApp, Skype, or Viber. These apps allow voice calls over an internet connection. Many Vietnamese businesses, especially in tourist areas, accept Zalo or WhatsApp calls. For calling landlines, Skype offers affordable credit-based calls to any phone number.
What if I buy a data-only eSIM and later need a number?
You can always add a local number later. Some mobile stores in Vietnam sell prepaid physical SIMs with a number without requiring a long contract. You could also buy a separate eSIM with a number from another provider. A data-only eSIM covers 90% of needs for most tourists.
Is a local number cheaper for calling back home?
Not necessarily. International calling rates from a Vietnamese number can be expensive (often $0.10–$0.50 per minute). Using a VoIP app like WhatsApp or Skype over a data-only eSIM is typically free (app-to-app) or costs a few cents for credit to call landlines. Data-only eSIMs are usually cheaper overall.