Vietnam eSIM with Real Local +84 Number — Grab & OTP Ready

The thing nobody tells you about Vietnam eSIMs

In most countries, that's fine. In Vietnam, it's a problem.
Vietnam runs on apps that require SMS verification to a local +84 number. Not a VoIP number. Not your home number on roaming. A real Vietnamese mobile number.
If you land in Hanoi with a data-only eSIM, you can check your email. You can post photos. You cannot book a Grab. You cannot order food delivery. You cannot receive the door code from your Airbnb host.
We learned this the hard way so you don't have to.

Why you need a local number in Vietnam

Grab (and Be, and GreenSM)

Vietnam doesn't really have Uber anymore. Grab dominates. Be is cheaper in some cities. Both require phone number verification via SMS.
Without a +84 number, you have two options:
  1. Use your home number and pray roaming SMS works (it often doesn't, or arrives 10 minutes late when the driver has already left).
  2. Negotiate with taxi drivers who "forgot" the meter and suddenly remember a "special airport price" that's 3x the Grab rate.
We've been there. The taxi from Noi Bai to the Old Quarter should cost 300,000 VND. Without Grab, the first driver quoted us 900,000. We walked away. The second quoted 700,000. We were tired. We paid it.
A local number gets you Grab. Grab gets you fair prices.

Food delivery

ShopeeFood and GrabFood are lifesavers when it's 35°C and you don't want to walk to a restaurant. But the driver needs to call you when they can't find your building. If they can't reach you, they cancel the order and you still get charged.

Hotels and homestays

Many mid-range and budget places in Vietnam operate via WhatsApp or SMS. They send you:
  • The door code for the smart lock
  • WiFi password
  • Breakfast time changes
  • "Sorry, the water heater is broken today"
Without a local number, you're relying on email (which they don't check) or walking to the front desk (which closes at 9 PM).

Tour bookings and emergencies

Most tour operators in Vietnam communicate via WhatsApp or Zalo (the local messaging app). If they need to cancel a Ha Long Bay cruise because of weather, they'll text or call your local number. If they can't reach you, you show up at the dock at 7 AM for a boat that isn't leaving.

Banking and e-wallets (optional but useful)

MoMo and ZaloPay are Vietnam's digital wallets. Tourists don't strictly need them, but some small restaurants and coffee shops only accept cash or MoMo. Having a local number lets you set up an account and load it with cash at any convenience store.

What TadiSim gives you

Every TadiSim plan includes:
  • A real +84 Vietnamese mobile number — not VoIP, not a forwarding service. A genuine number on the Viettel, Vinaphone, or Mobifone network.
  • Instant SMS and OTP reception — Grab, Be, Gojek, hotel apps, food delivery. All of it works immediately.
  • 100 free local minutes — call hotels, drivers, tour guides. Or call your travel buddy if they also have a TadiSim (calls between TadiSim numbers are free).
  • 100 free local SMS — useful for older systems that still use text messages.
  • High-speed data — 6GB/day (10-day plan) or 5GB/day (20-day plan) on 4G/5G. Unlimited slower data after that.
  • Hotspot/tethering — share your connection with your laptop or travel partner.

The technical stuff (for people who care)

Is it a real SIM or a virtual number? Real. It's an eSIM profile provisioned directly on the Viettel, Vinaphone, or Mobifone network. Your phone registers as a local subscriber. The number is indistinguishable from a physical SIM bought in a Hanoi phone shop.
Can I keep my home number active? Yes. That's the point of eSIM. Your home physical SIM stays in your phone. You can receive calls and texts from home while using TadiSim for data and local calls. In your phone settings, set:
  • Voice & SMS: Home SIM (so your family can reach you)
  • Mobile Data: TadiSim (so you don't pay roaming charges)
Does it work with all phones? Any phone that supports eSIM and is carrier-unlocked. iPhone XR/XS and newer. Samsung S20 and newer. Google Pixel 3 and newer. See our compatibility guide for the full list.
What happens after my plan expires? The number stops working. If you want to keep it longer, you'd need a local prepaid plan from a physical store. For 99% of travelers, 10-20 days is plenty.

Who this is for

Get a local number if:
  • You're traveling independently (not on a tour group)
  • You're staying in Airbnb, homestays, or budget hotels
  • You plan to use Grab or Be
  • You're traveling with a partner or group and want to stay connected without WiFi
  • You're a digital nomad working from cafes and need reliable hotspot
You can skip the local number if:
  • You're on an all-inclusive tour that handles all transport
  • You're staying at a 5-star hotel with a concierge who books everything for you
  • You only need Instagram and Google Maps
  • Your phone is locked and can't use eSIM anyway

How it works

  1. Buy online — pick your plan (10 or 20 days)
  2. Check your email — QR code arrives in 60 seconds, along with your +84 number
  3. Scan and activate — before you fly or when you land
  4. Install Grab — use your new +84 number for SMS verification
  5. Book a ride — from the airport to your hotel, at the real price, no negotiation

Real customer note

"I tried to sign up for Grab with my UK number for 20 minutes at the airport. Never got the SMS. Bought TadiSim sitting at the baggage claim, had the QR code before my suitcase arrived. Grab account verified in 30 seconds. Booked a car while waiting for coffee."
— Emma W., Manchester
Every TadiSim includes a real local number. No exceptions. No extra fees. If your plan doesn't show a +84 number in the delivery email, contact us immediately and we'll fix it.


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