How to Install and Activate Your Vietnam eSIM (iPhone & Android)

An eSIM installs in a few minutes, but a few settings make all the difference between “connected the moment I land” and “why isn’t this working?”. Here’s the step-by-step, on iPhone and Android — plus fixes for the most common snags.

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The golden rule: install before, activate after

Remember this distinction, it prevents 90% of problems:

• Install the eSIM (scan the QR code) before departure, at home, while you have wifi.
• Turn on data roaming only on arrival in Vietnam, when your phone picks up the Viettel network.

Installing doesn’t use up your plan: on a local Viettel eSIM, the countdown starts automatically when your phone attaches to a Viettel tower in Vietnam.

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Installing the eSIM on iPhone

1. Make sure you’re connected to wifi.
2. Open Settings → Cellular (or Mobile Data) → Add Cellular Plan.
3. Scan the QR code received by email.
4. Follow the prompts. Label the line (“Vietnam”, for example) so you recognize it.
5. Keep your primary line as the default for calls; the eSIM will handle data in Vietnam.

On arrival: Settings → Cellular, select the Vietnam line, turn on Cellular Data and Data Roaming.

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Installing the eSIM on Android

Menus vary slightly by brand (Samsung, Google Pixel, etc.), but the principle is the same:

1. Connect to wifi.
2. Open Settings → Connections (or Network & Internet) → SIM cards → Add eSIM.
3. Scan the QR code received by email.
4. Confirm the profile download and label the line.
5. On arrival, set the eSIM as the mobile data line and turn on data roaming.

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APN: normally nothing to do

On a local Viettel eSIM, the official v-internet APN configures itself automatically. You don’t need to enter anything.

If, exceptionally, data won’t come through, you can check or enter the APN manually:

• iPhone: Settings → Cellular → Cellular Data Network → select the eSIM line → enter v-internet in the APN field.
• Android: Settings → Connections → Mobile networks → Access Point Names (APN) → add an APN named Viettel with v-internet.

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Hotspot sharing

Hotspot sharing works with a local Viettel eSIM. If the hotspot won’t turn on or stays greyed out, the most common cause is simple: mobile data is still using your original SIM, not the Vietnam eSIM.

The fix:

1. Check that the mobile data line is the Vietnam eSIM.
2. Turn on data roaming for that line.
3. Restart the phone (or toggle Airplane mode).
4. Re-enable hotspot sharing.

Note: sharing drains your plan faster, especially with a laptop. Keep an eye on your balance.

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Checking your data balance

On a Viettel eSIM, no third-party app needed: open your messaging app and text KTTK to 191. Viettel instantly replies with your remaining data.

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Quick troubleshooting

Problem	Fix
No internet on arrival	Turn on cellular data + data roaming on the eSIM line
”Cannot add cellular plan”	Check the phone is eSIM-compatible and unlocked
Hotspot greyed out	Set the eSIM as the data line, then re-enable sharing
Slow data	Check the balance (KTTK to 191) — you may have hit the daily 5GB cap
Nothing works	Restart, or toggle Airplane mode

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Ready to go

An eSIM installed correctly before departure guarantees you’re connected the moment you leave the plane. To choose your plan and duration, see our Vietnam eSIMs at sogdiaroam.com.

Need the big picture? Go back to the complete Vietnam SIM card and eSIM guide. And to avoid the traps on arrival, read airport SIM cards: prices and scams.