How to Buy and Activate Viettel eSIM Before Arriving
Imagine stepping off the plane in Hanoi or Ho Chi Minh City and having mobile data working instantly – no airport SIM kiosk queue, no fumbling with a tiny physical SIM tray. With a Viettel eSIM purchased online before your trip, the eSIM activates automatically the moment your phone connects to Viettel's network in Vietnam. This guide walks you through every step, from checking phone compatibility to troubleshooting common hiccups.
1. Check if Your Phone Supports eSIM
eSIM support is standard on most modern phones. iPhone XS and newer models (except mainland China, Hong Kong, and Macau variants) support eSIM. Samsung Galaxy S20, Note20 and newer, Google Pixel 3 and newer, plus most Android phones released after 2020 also work. If you're unsure, check your model at the official Apple, Samsung, or Google support pages before purchasing.
Your phone must be carrier-unlocked. A device locked to a specific carrier (e.g., locked to a US or Japanese carrier) will not accept a Vietnamese eSIM. Also, using dual-SIM (physical SIM + eSIM) works fine: you can keep your home number active for receiving SMS while using Viettel data. This is handy for banking codes or two-factor authentication.
2. Choose the Right Viettel Plan
Viettel offers three data plans: 7 days for $10, 15 days for $11, and 30 days for $15. Each plan gives you 5 GB of high-speed data per day, then unlimited throttled data at about 128 kbps – enough for messaging and maps but not video streaming. Prices are fixed, with no hidden fees.
All plans include free incoming calls and SMS within Vietnam (outgoing calls are not included). Pick the duration that matches your trip length: 7 days is ideal for short layovers or a week-long stay, while 15 or 30 days suit longer travel or as a backup data source. If you need more than 30 days, contact us for options.
3. Purchase the eSIM on simvietnam.telebox.vn
Once you've chosen a plan, visit simvietnam.telebox.vn and select the Viettel eSIM that matches your trip length. Complete checkout using a credit/debit card or other available payment methods. After payment, you'll receive the eSIM QR code via email immediately – no waiting for physical delivery.
The QR code is valid for activation within 30 days of purchase. You may install it on your phone at any time before your trip (see step 4), but activation only happens when you land in Vietnam. Store the email safely; you can also download the QR code as an image.
4. Install the eSIM Using the QR Code (Before Your Flight)
Install the eSIM before departure – you need a Wi-Fi connection to scan the QR code. On iPhone: go to Settings > Cellular > Add eSIM > Scan QR code. On Android: go to Settings > Connections > SIM manager > Add eSIM. Follow the on‑screen prompts. Label the new line as 'Viettel' or 'Data' to avoid confusion with your home line.
The default APN is set automatically by the eSIM profile; do not change it manually unless instructed by the carrier. If scanning fails due to poor lighting or a dirty camera lens, try entering the SM‑DP+ address and activation code manually from the email. The eSIM profile will be saved on your device but remains inactive until you land.
5. Activate When You Land in Vietnam
Activation is automatic: as soon as your phone connects to a Viettel tower in Vietnam, the eSIM profile activates. No manual steps are required. However, you must enable data roaming for the Viettel line – this is required even for local network connection. Go to your mobile network settings and turn on data roaming for that line.
If the eSIM doesn't activate within 5 minutes of landing, reboot your phone or toggle Airplane mode. If you keep your home SIM active, make sure data roaming is disabled on that line to avoid roaming charges. Your home SIM can still receive SMS and calls over the home network (if you have international roaming enabled) or use Wi‑Fi calling if available.
6. Troubleshooting Common Issues
If QR code scanning fails, ensure good lighting and clean the camera lens. As a fallback, you can enter the SM‑DP+ address and activation code manually from the email. If you still have no service after activation, confirm you are in an area with Viettel coverage – city centers and tourist hubs are well covered, but remote rural areas may have weak signal. Viettel, Vietnam's largest telecom, reports about 99% population coverage, but mountain passes or islands might be less reliable.
After using the daily 5 GB high‑speed data, speeds are throttled to roughly 128 kbps. This is enough for messaging, email, and light web browsing but not for video streaming or large file downloads. For persistent issues, contact support via the chat or email on the website where you purchased the eSIM – include your order ID for faster help.
FAQ
Can I install the Viettel eSIM before I fly to Vietnam?
Yes, you should install the eSIM profile on your phone before departure. It will remain inactive until your phone connects to Viettel's network in Vietnam, so there's no risk of accidentally starting the plan early.
Will a Viettel eSIM work on my iPhone 15 from the US?
Most likely yes, provided your iPhone 15 is carrier-unlocked. iPhone 15 models from the US (all sold unlocked) support eSIM without a physical SIM slot. Just check that your device is not locked to a specific US carrier – if it is, you'll need to unlock it before using the Viettel eSIM.
What happens if I lose the QR code email?
Contact the support team from the store where you purchased the eSIM. Provide your order ID, and they can resend the QR code. It's a good idea to save a screenshot of the QR code after purchase in case your email is lost.
Can I buy the eSIM for someone else and send them the QR code?
Yes, you can purchase the eSIM as a gift or for a travel companion. After payment, forward the QR code email to them. They'll install the profile on their own phone following the same steps. Each eSIM is tied to a single device once installed.
Does the eSIM automatically activate when I land, or do I need to do something?
It activates automatically when your phone connects to a Viettel tower in Vietnam. No manual step is required, but you must have data roaming enabled for the Viettel line. If it doesn't work within a few minutes, reboot your phone or toggle Airplane mode.