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Using a Prepaid eSIM in Vietnam: Step-by-Step for 2026

10 min readBy Daniel Mercer, Lead eSIM Analyst
  • 2 networks verified
  • 7 plans compared
  • Updated June 2026

Daniel Mercer

Lead eSIM Analyst

43 countries tested280 plans reviewed14 airports tested8 years in telecom

Previously at Analysys Mason covering APAC mobile markets (2016-2021)

How we test

Published July 2026 · Updated June 2026

Pre-Departure

What to do before flying to Vietnam

Check your phone compatibility

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Choose the right plan for Vietnam

The cheapest plan starts at $3.49 for 1GB. For a typical 8-day trip, a 5GB plan covers most travelers.

eSIM plan pricing for Vietnam
PlanPriceBest For
1GB$3.49Day trips, light messaging
3GB$7.49Weekend trips, maps and messaging
5GB$11.09One-week trips, moderate use
10GB$19.31Two-week trips, streaming
20GB$27.49Extended stays, heavy data use

Compare all Vietnam eSIM plans and pricing

Install at home over WiFi

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What to download before you go

  • Offline maps: download Vietnam cities in Google Maps or Maps.me
  • Translation app: Google Translate with Vietnam language pack downloaded offline
  • Currency converter: XE or Wise for VND exchange rates
  • Provider app: download and log in to Nomad before departure

On Arrival

Arriving at Tan Son Nhat (SGN) / Noi Bai (HAN): activate your eSIM

When to turn on your eSIM

Activate your eSIM after clearing customs at Tan Son Nhat (SGN) / Noi Bai (HAN), before you leave the terminal. Do not enable it during a layover at a connecting airport. Most plans start counting from the first network connection, not from installation. Enabling during transit burns a full day of your plan.

Connecting to Viettel's network

  1. Open Settings on your phone
  2. Go to Cellular (iPhone) or Network & Internet (Android)
  3. Select your travel eSIM line
  4. Enable Data Roaming on that line only
  5. Wait 2-3 minutes for Viettel's 5G network to register

Expected speeds on Viettel: approximately 52 Mbps download.

Airport WiFi as backup

Tan Son Nhat (SGN) / Noi Bai (HAN) offers reliable free WiFi. Use it as a backup to complete eSIM installation if you did not set up at home. Airport WiFi often requires a phone number to register, so installing at home is the safer option.

What if your eSIM does not connect

  1. Toggle Data Roaming off and back on
  2. Restart your phone
  3. Verify the travel eSIM is selected as your cellular data line
  4. Try manual network selection: choose Viettel
  5. For emergencies, dial 113/115

Configuration

Data line configuration for Vietnam

Dual-SIM configuration

Keep your home SIM for calls and texts. Set the travel eSIM as your cellular data line. On iPhone: Settings > Cellular > Cellular Data > select travel eSIM. On Android: Settings > Network & Internet > SIMs > set travel eSIM for mobile data. iMessage and FaceTime should stay on your home number.

Data roaming settings

Enable data roaming on the travel eSIM line only. Disable data roaming on your home SIM to prevent carrier charges. On iPhone: Settings > Cellular > select home SIM > Data Roaming OFF. On Android: Settings > Network > SIMs > home SIM > Roaming OFF.

APN configuration

Most eSIMs auto-configure APN settings for Viettel. Verify in Settings > Cellular > Cellular Data Options > Cellular Data Network. If auto-configuration fails, check your provider's email for manual APN values. Manual entry is rare but occasionally needed on older Android devices.

Troubleshooting

Fixing eSIM problems in Vietnam

VPN and internet restrictions

Vietnam restricts VPN usage. VPNs not illegal but government blocks many VPN services; Facebook and Google generally accessible Download your VPN app before arrival — installation may be blocked once you connect to a local network. Configure obfuscation or stealth mode if your VPN supports it. Saily pairs eSIM data with NordVPN in a single account, which simplifies the setup for privacy-conscious travelers. A prepaid eSIM on 5G gives your VPN the stable cellular backbone it needs to stay connected.

SIM registration and ID requirements

Passport required; real-name registration mandatory since 2018 With a prepaid eSIM, the provider handles registration remotely. You do not need to visit a counter or present your passport in person.

Speed and coverage in rural areas

Viettel provides the broadest coverage in Vietnam, but speeds drop outside major cities. Urban areas average 52 Mbps. Rural areas may see 5-15 Mbps on LTE. 5G is available in select areas (urban-only).

Common error messages

"eSIM not supported"
Your phone is carrier-locked. Contact your home carrier to unlock (24-72 hours).
"No service"
Data roaming is off on the travel eSIM line. Enable it in Settings.
"Plan expired"
The plan was activated too early (during a layover). Contact the provider for a replacement.
"Unable to activate"
eSIM profile slot is full. Delete unused profiles in Settings > Cellular. iPhones hold 8 profiles (2 active).

Full eSIM troubleshooting guide

Data Tips

Vietnam data budget guide

How much data you need

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Stretching your data in Vietnam

  • Download offline maps before departure (saves 50-200 MB/day)
  • Use Vietnam's good hotel and cafe WiFi for heavy downloads
  • Turn off background app refresh and auto-play videos
  • Enable Low Data Mode (iPhone) or Data Saver (Android)

Topping up mid-trip

If your plan runs out, buy additional data through the Nomad app. Top-ups apply instantly with no new QR code needed. Alternatively, switch to an unlimited daily plan starting at $4.25/day.

How to top up your eSIM mid-trip

Peak season data congestion

During Oct-Apr in Vietnam, network congestion can reduce speeds in popular tourist areas. Dry season varies by region; north is best October-April, south November-April Consider upgrading one plan tier during peak months for a buffer.

Provider Setup

Step-by-step activation per provider for Vietnam

Airalo

  1. Open Airalo (app or website). Type "Vietnam" in the search bar.
  2. Compare plans by data amount and validity period. Entry-level: $3.49 for 1GB. Pick the tier that matches your data needs.
  3. Check out with your preferred payment method. Airalo confirms the order via email and in-app notification.
  4. Navigate to "My eSIMs," find the Vietnam plan, and tap "Install." The app guides you through eSIM setup on your specific device.
  5. Label the new eSIM "Vietnam Data." Set it as your data line under Settings > Cellular > Cellular Data.
  6. Disable the eSIM until departure. The plan activates on first network connection — toggling it on during a layover burns a day.
  7. After landing in Vietnam: enable the eSIM, turn on data roaming, and confirm Viettel registers within 60-90 seconds.
Time: 5-7 minutes from purchase to installed profileSupport: In-app live chat (average response: 4 minutes). Email: support@airalo.com.

connects to Viettel and Vinaphone's 5G/LTE network in Vietnam (52 Mbps average). Airalo routes through Viettel for most Vietnam plans.

Holafly

  1. Open holafly.com or the Holafly app and select Vietnam.
  2. Pick your plan. Unlimited options include a daily data threshold after which speeds reduce. Fixed-data plans offer full-speed access until the allowance runs out. Tethering is typically blocked on unlimited plans for Vietnam.
  3. Complete checkout. Holafly emails the QR code and setup instructions.
  4. Scan the QR code from another device's screen. iPhone: Settings > Cellular > Add eSIM. Samsung: SIM Manager > Add eSIM. The profile downloads in seconds.
  5. Label the eSIM "Vietnam Data" and set it as your data line. Keep it disabled until you land.
  6. After arriving at Tan Son Nhat (SGN) / Noi Bai (HAN): enable the profile, enable data roaming, and wait for Viettel's network.
  7. Confirm data works by loading any page. Contact Holafly via WhatsApp (+34 644 44 37 97) if activation fails.
Time: 5-10 minutes (QR code arrives via email)Support: WhatsApp: +34 644 44 37 97 (avg response: 8 min). Email: help@holafly.com.

connects to Viettel and Vinaphone's 5G/LTE network in Vietnam (52 Mbps average). Holafly's unlimited plans connect to Viettel with a daily fair-use threshold.

Saily

  1. Open the Saily app. Search "Vietnam" and view available plans.
  2. All plans are fixed-data with hotspot included. Plans start at $3.49 for 1GB. No fair-use throttling.
  3. Purchase through the app. The eSIM profile is ready immediately.
  4. Tap "Install" and follow the on-screen instructions to add the eSIM profile to your phone.
  5. Label it "Vietnam Data." Configure it as your data line in Settings.
  6. Leave the profile off until you reach Vietnam. Enable after landing at Tan Son Nhat (SGN) / Noi Bai (HAN).
  7. Viettel registers the eSIM in 60-90 seconds. Load a webpage to verify connectivity.
Time: 3-5 minutes (in-app installation, no QR email needed)Support: In-app support. Email: support@saily.com. Backed by NordVPN's 24/7 team.

connects to Viettel and Vinaphone's 5G/LTE network in Vietnam (52 Mbps average). Saily's fixed-data plans include hotspot on Viettel's network.

Nomad

  1. Open Nomad (app or web). Select Vietnam and browse available plans.
  2. Pick a single-country plan for direct Viettel coverage. Regional plans cover more countries but trade speed for range.
  3. Complete checkout. QR code appears in your account.
  4. Scan the QR code via Settings > Cellular > Add eSIM (iPhone) or SIM Manager > Add eSIM (Samsung).
  5. Name the profile "Vietnam Data." Set as data line. Disable until landing.
  6. At Tan Son Nhat (SGN) / Noi Bai (HAN): enable eSIM, enable data roaming, wait 60-90 seconds for Viettel.
  7. Test connectivity. If issues arise, submit an in-app support ticket to Nomad.
Time: 5-8 minutes (QR code generated in-app)Support: In-app ticket system. Email: help@getnomad.app.

connects to Viettel and Vinaphone's 5G/LTE network in Vietnam (52 Mbps average). Nomad single-country plans connect directly to Viettel.

Installation Methods

QR code vs app: two ways to install your Vietnam eSIM

QR Code Scan Method

  1. Purchase your Vietnam eSIM from any provider (Airalo, Holafly, Saily, Nomad). The QR code arrives via email or is displayed in your account dashboard.
  2. Display the QR code on a separate screen — laptop, tablet, or a printed copy. You cannot scan a QR code on the same phone you are installing the eSIM on.
  3. On your phone: iPhone — Settings > Cellular > Add eSIM > Use QR Code. Samsung — Settings > Connections > SIM Manager > Add eSIM > Scan QR Code. Pixel — Settings > Network & Internet > SIMs > Add SIM > Download SIM.
  4. Point your camera at the QR code. The eSIM profile downloads in 5-15 seconds over WiFi.
  5. Tap "Activate" or "Add" when prompted. Label the plan "Vietnam Data."
  6. Disable the eSIM after installation. Enable it after landing at Tan Son Nhat (SGN) / Noi Bai (HAN).

Pros:

  • Works with any eSIM provider — universal method across all platforms.
  • No app installation required — uses your phone's built-in Settings flow.
  • The QR code is a one-time-use credential: once scanned, the profile is on your device permanently (until you delete it).
  • Faster initial setup: scanning takes 10 seconds vs app download + account creation.

Cons:

  • Requires a second screen to display the QR code — cannot scan from the same device.
  • Requires WiFi or mobile data for the download.
  • If the scan fails, you need the SM-DP+ manual entry code from the confirmation email as a fallback.
  • QR codes are single-use for most providers — losing the email before scanning means contacting support.

Best for: Travelers installing at home before departure, users who prefer not to install additional apps, and anyone setting up a Vietnam eSIM on a secondary phone or tablet.

Provider App Installation

  1. Download your provider's app: Airalo (iOS/Android), Holafly (iOS/Android), Saily (iOS/Android), or Nomad (iOS/Android).
  2. Create an account or sign in. Search for "Vietnam" in the destination field.
  3. Select and purchase your plan. Plans start at $3.49 for 1GB.
  4. The app presents an "Install" button for your Vietnam plan. Tap it. The app opens your phone's native eSIM settings and guides you through the process.
  5. Follow the on-screen prompts. The app handles QR code scanning internally — no second screen needed.
  6. After installation, the app shows your plan status: data remaining, validity period, and connected carrier (Viettel in Vietnam).

Pros:

  • No second screen needed — the app handles the QR scanning or direct provisioning internally.
  • Built-in plan management: monitor data usage, check validity, and view carrier connection status.
  • Easier reactivation: if you visit ${country.name} again, the app stores your purchase history.
  • Some apps (Airalo, Saily) support direct eSIM provisioning — no QR code needed at all.

Cons:

  • Requires downloading a 50-100 MB app before installation — uses storage and initial data.
  • Account creation adds 2-3 minutes to the process.
  • Each provider has a separate app — managing plans across Airalo, Holafly, and Saily means three apps.
  • App updates can temporarily break the installation flow on older OS versions.

Best for: First-time eSIM users who want guided setup, travelers who buy from the same provider regularly, and anyone who wants in-app data monitoring during their Vietnam trip.

Recommendation: For Vietnam, install at home before departure using whichever method your provider offers. If you already have the provider app, use it — the guided flow reduces setup errors. If you prefer minimal installs, the QR code method works with just your phone's Settings app and a second screen. Both methods produce the same result: a Vietnam eSIM profile on Viettel's 5G/LTE network, ready to enable after landing at Tan Son Nhat (SGN) / Noi Bai (HAN).

Timing

When to set up your Vietnam eSIM: before or after you fly?

Pre-Departure Setup (Recommended)

Install your Vietnam eSIM at home 24-48 hours before departure. Scan the QR code over stable WiFi, configure your data line, and toggle the profile off. The entire setup takes 5 minutes in a calm environment. After landing at Tan Son Nhat (SGN) / Noi Bai (HAN), one toggle connects you to Viettel's 5G/LTE network in 60-90 seconds. No searching for WiFi, no SIM counter queue, no jet-lag mistakes during Settings navigation.

Pros:

  • Reliable WiFi at home — no captive portals or unstable airport networks.
  • No time pressure. If the QR code fails, you have hours to contact support.
  • Jet-lag-free setup. Configuring Settings after a 12-hour flight leads to mistakes.
  • Immediate data on landing: Viettel connects in 60-90 seconds, no WiFi search.
  • No SIM counter detour at Tan Son Nhat (SGN) / Noi Bai (HAN) — skip the 10-15 min queue and $5-15 for 6-20GB / 15-30 days tourist markup.
  • Plan timer does not start until Viettel registers the profile — no wasted days.

Cons:

  • Must remember to install before departure — not an option if you forget.
  • Plan validity begins on first network connection, not purchase date — but activating during a layover still burns a day.
  • If you change your travel dates after installation, the eSIM sits unused until you travel.

Choose when: Best for: all planned trips. Install 24-48 hours before departure.

On-Arrival Setup at Tan Son Nhat (SGN) / Noi Bai (HAN)

Installing after arrival at Tan Son Nhat (SGN) / Noi Bai (HAN) is possible but adds friction. You need WiFi for the QR code scan — Tan Son Nhat (SGN) / Noi Bai (HAN)'s public WiFi is generally reliable. After a long flight, navigating Settings on a tired brain introduces error risk: selecting the wrong data line, forgetting to enable roaming, or entering the wrong APN string. The alternative — the SIM counter — costs $5-15 for 6-20GB / 15-30 days with a 10-15 min wait.

Pros:

  • Plan timer starts immediately after first connection — no risk of accidental activation during layovers.
  • No advance planning needed — works for last-minute trips.
  • SIM counter at Tan Son Nhat (SGN) / Noi Bai (HAN) provides a physical backup option ($5-15 for 6-20GB / 15-30 days).

Cons:

  • Requires WiFi for QR scan.
  • Jet-lag mistakes: wrong data line, roaming left off, APN entry errors.
  • 5-15 minutes of setup time at the airport instead of immediate data.
  • SIM counter costs $5-15 for 6-20GB / 15-30 days with a 10-15 min queue — your only alternative if the eSIM download fails.
  • Physical SIM requires Passport required — adds 15-30 minutes.

Choose when: Best for: last-minute trips where pre-departure setup was not possible.

Verdict: Install at home. Every variable works in your favor: stable WiFi, no time pressure, no jet lag. The Vietnam eSIM sits dormant until you enable it at Tan Son Nhat (SGN) / Noi Bai (HAN). There is no advantage to on-arrival setup and multiple risks.

Verify

Post-activation checklist for Vietnam

eSIM verification checklist for Vietnam
StepWhat to checkIf it fails
Check carrier name in status barYour status bar should display "Viettel" or "Vinaphone" within 60-90 seconds of enabling the eSIM. The 5G/LTE indicator confirms your connection type.If "No Service" or "Searching..." persists after 2 minutes: Settings > Cellular > Network Selection > turn off Automatic, wait 10 seconds, turn it back on. If Viettel does not appear, restart your phone.
Verify data line assignmentOpen Settings > Cellular > Cellular Data. Confirm the Vietnam eSIM is selected as the active data line. If your home SIM is selected, all data routes through your home carrier at roaming rates.Tap "Cellular Data" and select the Vietnam eSIM. Disable "Allow Cellular Data Switching" to prevent automatic fallback to your home SIM when Viettel's signal dips briefly.
Confirm data roaming is enabledSettings > Cellular > [Vietnam eSIM] > Data Roaming must be ON. Most travel eSIM plans route through roaming agreements — data roaming must be enabled for the travel line specifically.Toggle Data Roaming ON for the Vietnam eSIM line only. Leave roaming OFF on your home SIM to prevent accidental charges.
Load a webpage to verify data flowOpen Safari or Chrome and load any webpage. If the page renders within 3 seconds, your Vietnam eSIM is delivering data on Viettel's 5G/LTE network. Slow loads (10+ seconds) indicate APN misconfiguration.If the page does not load: check Settings > Cellular > Cellular Data Network for APN settings. If blank, contact your eSIM provider for the correct APN string for Viettel's network in Vietnam.
Test messaging appsText messaging in WhatsApp, Telegram, and iMessage works over data. Voice and video calls are restricted in Vietnam — enable your VPN before attempting WhatsApp or FaceTime calls.If calls do not connect, enable your VPN first. Vietnam blocks VoIP at the network level. If the VPN does not connect, try a different VPN server location.
Verify emergency dialing capabilityEmergency calls to 113/115 work from any active SIM in Vietnam, even without data. With eSIM data active, your phone's emergency SOS feature also shares your GPS location with responders.Emergency calls bypass SIM restrictions. If your eSIM has no data, the call still connects through any available network. Store 113/115 in your phone contacts as "Vietnam Emergency."
Check remaining data balanceOpen your eSIM provider's app (Airalo, Holafly, Saily, or Nomad) and verify your remaining data and validity period. The plan timer started when Viettel first registered your profile.If the app shows zero data remaining immediately after activation, the plan may have been activated during a layover. Contact your provider's support for a replacement or top-up.

Data Tips

Make your Vietnam eSIM data last longer

Download offline maps before departure

Google Maps and Maps.me allow offline downloads for specific regions. Download Vietnam's major cities before leaving WiFi. Offline maps use zero cellular data for navigation. A single city map is 50-200 MB — download at home, not on your eSIM.

Disable background app refresh

Go to Settings > General > Background App Refresh (iPhone) or Settings > Battery > Background Usage Limits (Samsung). Background refresh consumes 200-500 MB per day without visible activity. Social media apps, news feeds, and email clients refresh constantly. Disable all except essential apps while on your Vietnam eSIM.

Pause cloud sync and auto-backups

iCloud Photos, Google Photos, and cloud backup services upload images and videos over cellular data. A single day of vacation photos can consume 1-3 GB in background uploads. Pause cloud sync: iPhone — Settings > Photos > Cellular Data > toggle off. Android — Google Photos > Settings > Back up & sync > Use cellular data > off. Sync manually over WiFi at your hotel each evening.

Use WiFi when available

Vietnam has good public WiFi. Free WiFi common in cafes and hotels in tourist areas. Use hotel and cafe WiFi for data-heavy tasks: video calls, software updates, large downloads, and cloud sync. Reserve your eSIM data for on-the-go navigation and messaging.

Set video quality to low on streaming apps

Standard definition video uses about 700 MB per hour. HD uses 1.5-3 GB. If you stream on your Vietnam eSIM, set Netflix, YouTube, and other apps to "Data Saver" or "Low" quality. Better approach: download episodes over WiFi before going out.

Monitor data usage in real time

iPhone: Settings > Cellular > scroll to usage stats for each app. Samsung: Settings > Connections > Data Usage > Mobile Data Usage. Check daily. Set a data warning at 80% of your plan limit: iPhone uses Screen Time limits; Samsung has a built-in data warning under Data Usage settings. Your eSIM provider's app also shows remaining data for your Vietnam plan.

Plan for 8-day trips

The average trip to Vietnam lasts 8 days. At 1.2GB per day for standard use (maps, messaging, email, light browsing), budget 10-12 GB total. A 1GB plan at $3.49 covers this comfortably.

Peak season data note: Oct-Apr

During Oct-Apr, Viettel's network carries heavier traffic in tourist areas. Network congestion increases retransmission overhead, meaning your phone uses 10-20% more data per webpage load. Budget a slightly larger plan during peak months.

Business

Business travel to Vietnam: corporate eSIM management

Business travelers to Vietnam need data from the moment they land at Tan Son Nhat (SGN) / Noi Bai (HAN). A client call in the taxi, a document review at the hotel, or a last-minute schedule change — all require connectivity. A prepaid eSIM on Viettel's 5G/LTE network provides 52 Mbps average, supports hotspot for laptop tethering, and installs before departure. No corporate procurement cycle, no local SIM registration, no IT department involvement beyond confirming the device is unlocked.

Multi-device management

For teams traveling to Vietnam, each device needs a separate eSIM profile. One plan cannot be shared across phones. Purchase one plan per traveler and install all profiles before the team departs. At $3.49 per device for 1GB, a team of 5 costs less than a single corporate international roaming package. Label each eSIM with the traveler's name: "J. Smith - Vietnam" for easy identification in shared IT dashboards. If a team member's phone is company-managed (MDM), confirm with IT that the MDM profile allows eSIM installation — some corporate policies block it.

VPN and security

Vietnam restricts VoIP and some web services at the network level. Corporate VPN must be installed and tested before departure. Configure your VPN to route through the Vietnam eSIM's data line (Viettel's 5G/LTE network). Test the connection at home: connect the VPN, open your corporate email, join a test video call. Some VPNs authenticate against specific IP ranges — discovering a mismatch after landing wastes the first hour of a business trip. Data overhead: VPN adds 10-15% to all traffic. Budget a larger data plan for Vietnam business trips.

Expense tracking

eSIM expenses for Vietnam are straightforward to document. The purchase receipt from your provider (Airalo, Holafly, Saily, Nomad) includes: destination (Vietnam), data amount, validity period, price in USD, and purchase date. Forward the confirmation email to your expense system. Category: "Mobile/Telecom — International." Per-trip cost from $3.49 for 1GB — well below most corporate per-diem communication allowances.

Emergency protocol

Business emergency protocol for Vietnam: the local emergency number is 113/115. This call works from any SIM, even without data. With eSIM data active on Viettel's network, you can also share your GPS location, contact your company's travel security team via messaging, and pull up local hospital and embassy addresses. Save these contacts in your phone before departure: company emergency line, travel insurance provider, nearest embassy/consulate in Vietnam.

Transfer

Phone upgrade during your Vietnam trip: eSIM transfer guide

Replacing your phone during a Vietnam trip does not mean losing your eSIM data. The profile on Viettel's network can move to a new device through direct transfer or provider reissue. Have your original provider confirmation email accessible — it contains the SM-DP+ details needed for manual reactivation.

iPhone to iPhone

iPhone to iPhone (iOS 17+): Settings > Cellular > tap the Vietnam eSIM > Transfer to Nearby iPhone. Both phones must be within Bluetooth range, signed into the same Apple ID, and running iOS 17 or later. The transfer takes 2-5 minutes. Your Viettel connection resumes on the new device within 60 seconds. Quick Start during initial setup also offers eSIM transfer as part of the migration flow.

Android transfer

Samsung to Samsung or Pixel to Pixel: most Android manufacturers do not support direct eSIM transfer between devices. You need a new QR code from your eSIM provider. Contact Airalo (in-app chat, 4 min avg), Holafly (WhatsApp +34 644 44 37 97), or Saily (email support) and request a profile reissue for your Vietnam plan. The provider deactivates the old profile and issues a new QR code for the new device. Your remaining data and validity transfer to the new profile.

Cross-platform

iPhone to Android or Android to iPhone: cross-platform eSIM transfer requires provider intervention. Contact your provider's support, explain the device change, and request a new QR code. The Vietnam plan (remaining data and validity on Viettel's 5G/LTE network) transfers to the new profile. Install the new QR code on the replacement device, configure the data line, and enable roaming. Viettel registers in 60-90 seconds.

Warning: Do not delete the eSIM profile from your old device before confirming the transfer or receiving a new QR code. Deletion without a backup code may permanently deactivate the profile. Contact your provider first, complete the transfer process, and only then remove the old profile.

After Your Trip

Post-trip: what to do with your Vietnam eSIM

  1. Disable the Vietnam eSIM immediately: Settings > Cellular > [Vietnam Data] > turn off "Turn On This Line."
  2. Re-enable your home SIM as the primary data line: Settings > Cellular > Cellular Data > select your home SIM.
  3. Turn off data roaming on all lines: Settings > Cellular > each line > Data Roaming > Off.
  4. Check your Vietnam data usage in your provider app — note remaining balance for records or potential refund.
  5. Decide whether to keep or delete the Vietnam eSIM profile (see guidance below).

Your Vietnam eSIM stays on your phone after the trip unless you remove it manually. For repeat travelers: keep it and buy a new plan next time. For one-time visitors: delete it under Settings > Cellular > Remove Cellular Plan. Either way, disable the Vietnam eSIM immediately after returning home — leaving it active may trigger unexpected connection attempts on other networks.

Quick Answers

Common questions about eSIM in Vietnam

FAQ

Questions travelers ask about Vietnam eSIM

When should I activate my eSIM for Vietnam?

Activate your eSIM after you land and clear customs at Tan Son Nhat (SGN) / Noi Bai (HAN). Do not enable it during a layover because most plans start counting from the first network connection. Keep the eSIM toggled off until you reach Vietnam.

Does my eSIM work at Tan Son Nhat (SGN) / Noi Bai (HAN)?

Yes. Viettel's network covers Tan Son Nhat (SGN) / Noi Bai (HAN) and surrounding areas. After clearing customs, open Settings, select your travel eSIM, and enable data roaming. Your phone connects to Viettel within 2-3 minutes.

How much data do I need for 8 days in Vietnam?

Most travelers use 500 MB to 1.5 GB per day for maps, messaging, and light browsing. For a 8-day trip, a 5GB plan covers typical usage. Heavy streaming or video calls require more. Plans start at $3.49 for 1GB.

Can I use WhatsApp and FaceTime with my eSIM in Vietnam?

Yes. WhatsApp, FaceTime, and other data-based messaging apps work on all eSIM data plans in Vietnam. Some VoIP services may be restricted. A VPN installed before departure resolves this.

What if my eSIM stops working during my trip in Vietnam?

Toggle data roaming off and back on. Restart your phone. Verify the travel eSIM is selected as your cellular data line in Settings. If the issue persists, try manual network selection and choose Viettel. For emergencies, dial 113/115.

Can I keep my home phone number while using eSIM in Vietnam?

Yes. With dual-SIM, your home SIM handles calls and texts while the travel eSIM handles data on Viettel's network. Both lines stay active simultaneously. Set the travel eSIM as your cellular data line only.

Is WiFi reliable enough in Vietnam to skip an eSIM?

WiFi in Vietnam is good in hotels and cafes, but relying on WiFi alone leaves you without navigation, ride-share apps, and emergency access between hotspots. A prepaid eSIM keeps you connected everywhere, with WiFi as a data-saving supplement.

Do I need to register my eSIM in Vietnam?

Vietnam requires SIM registration for physical SIM cards. Passport required; real-name registration mandatory since 2018 eSIM providers handle registration on your behalf, so you do not need to visit a counter or provide ID in person.

Does eSIM work in Vietnam?

Seven steps to set up eSIM for Vietnam: (1) Confirm eSIM compatibility: iPhone XS or newer, Samsung S20 or newer, Pixel 3 or newer. (2) Purchase a data plan from Nomad starting at $3.49 for 1GB. (3) R...

What is the best eSIM for Vietnam?

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How much data do I need for Vietnam?

Seven steps to set up eSIM for Vietnam: (1) Confirm eSIM compatibility: iPhone XS or newer, Samsung S20 or newer, Pixel 3 or newer. (2) Purchase a data plan from Nomad starting at $3.49 for 1GB. (3) R...

Is eSIM cheaper than airport SIM in Vietnam?

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Can I use eSIM on iPhone in Vietnam?

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Nomad: from $1.37/GB on Viettel. Activates the moment you land.

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