Quick answer: The SIM card Vietnam from Viettel offers the widest coverage, including remote areas and islands like Phu Quoc.
Additionally, for most tourists, the Viettel 5GB/day plan (150,000 VND) is the sweet spot.
If you have an eSIM-compatible phone, Airalo and Mobimatter offer reliable data-only eSIMs starting from $8 USD for 30 days.
For short trips under 10 days, a tourist SIM from the airport works fine.
For longer stays, buy a local SIM in the city for better rates.
Planning a trip to Hon Thom Island, Sunset Town, or Grand World? Moreover, staying connected is essential—for Grab rides, Google Maps, and booking last-minute activities. This guide breaks down all the options, so you know exactly what to buy and where.
📱 Vietnam’s Mobile Network Operators
Vietnam has four main operators. Here’s how they compare:
Viettel is the best overall. It offers widest coverage, fast 4G/5G, and reaches remote areas, islands, and mountains. Excellent signal on Phu Quoc and Ha Long Bay follows. Prices are competitive.
Vinaphone — second largest. It has good coverage in cities and along highways. It is sometimes cheaper than Viettel. It is less reliable in remote areas.
Mobifone is good in cities. It works fine in tourist areas. It is usually the cheapest. Coverage is weaker outside urban centers.
Vietnamobile — budget option. It is affordable but has limited coverage. Best for city-only trips.
Verdict: For most travelers, Viettel is the safest choice.
Moreover, it works where others don’t — including Hon Thom Island.
Additionally, Tourist SIM Cards at the Airport
All three major operators sell tourist SIMs at airports (Hanoi, Saigon, Da Nang). They are convenient but more expensive than city rates.
Typical tourist SIM packages (2026):
- 5GB/day: 150,000 VND ($6 USD) — 5GB high-speed data per day, unlimited calls
- 10GB/day: 200,000 VND ($8 USD) — for heavy users
- 30GB total (30 days): 250,000 VND ($10 USD) — best for longer trips
Where to buy: Official operator booths at the airport — Viettel, Vinaphone, Mobifone.
Additionally, avoid third-party resellers outside the arrival hall — they often charge double.
What you need: Passport (they’ll take a copy) and cash (VND or USD).
If you buy a tourist SIM, it works for 30 days. Additionally, after that, you need to top up or buy a local SIM.
🏙️ Local SIM Cards in the City
If you have time, buying a SIM from a local Viettel/Vinaphone/Mobifone store in the city is cheaper than the airport. Prices are about 30–40% lower.
Typical local SIM prices (city) vary by provider and plan.
- 3GB/day (30 days): 80,000 VND ($3.2 USD)
- 5GB/day (30 days): 120,000 VND ($4.8 USD)
- 10GB/day (30 days): 180,000 VND ($7.2 USD)
- Unlimited data (30 days): 250,000 VND ($10 USD) — best if you’re a heavy user
Where to find stores: Search “Viettel store” on Google Maps. Additionally, they’re everywhere in tourist areas.
What you need: passport and cash.
📲 eSIM for Vietnam — The Smart Alternative
If your phone supports eSIM, this is the most convenient option.
For example, iPhone XS and newer work well, and so do most flagship Android phones.
Additionally, you buy it online before you travel, scan a QR code, and it works immediately on arrival.
Best eSIM providers for Vietnam (2026):
- Airalo: $8–$15 USD for 3–30 GB, 30 days. Uses Viettel’s network. Reliable and easy to set up.
- Mobimatter: $7–$12 USD for 3–20 GB, 15–30 days. Competitive prices, good coverage.
- Holafly: $19–$37 USD for unlimited data, 5–20 days. Unlimited data is convenient for heavy users.
- Nomad: $6–$15 USD for 3–20 GB, 30 days. Flexible plans, uses Viettel or Vinaphone.
- Ubigi: $12–$20 USD for 5–20 GB, 30 days. Good for short trips.
First, here is how to set up.
- Buy the eSIM online from the provider’s website or app.
- Receive a QR code via email or app.
- Scan the QR code with your phone’s camera (Settings → Cellular → Add eSIM).
- Activate the plan — it usually starts when you connect to a supported network in Vietnam.
Pro tip: eSIMs are data-only. You won’t have a Vietnamese phone number for calls and SMS. For most travelers, this is fine — you’ll use WhatsApp, Messenger, or Telegram for communication.
📊 Operator Coverage Comparison
Viettel: Excellent across the country. This is the best choice for Phu Quoc, Ha Long Bay, Sapa, and remote areas.
Vinaphone: Good in cities and along highways. Works well in Nha Trang, Da Nang, and Ho Chi Minh City.
Mobifone: Good in tourist areas.
However, less reliable in remote locations.
Vietnamobile: Limited coverage. Only for city-only trips.
Phu Quoc specific: Viettel has the strongest signal on the island, including Hon Thom Island.
Additionally, Viettel covers the island itself.
Phone compatibility and settings
Frequency bands: Vietnam uses 4G/LTE bands 1, 3, 5, 7, 8, 20, 28. Most modern phones support these. If you’re unsure, check your phone’s specs.
Unlocked phone: Your phone must be unlocked (not tied to a specific carrier). Most phones sold outside the US are unlocked.
APN settings: For local SIMs, the store will set this up for you. For eSIMs, it is pre-configured.
📌 Practical Tips
- Buy a Viettel SIM if you’re visiting islands or remote areas.
- eSIM is the most convenient — buy it before you travel and it works immediately.
- Avoid airport resellers — use official booths only.
- Keep your passport ready — registration is mandatory for all SIM cards.
- Top up at convenience stores — 7-Eleven, Circle K, and local shops sell top-up cards.
- Use WhatsApp or Telegram — you don’t need a Vietnamese number if you use these apps.
- Check data usage — some plans are daily, some are total. Choose based on your usage.
❓ Frequently Asked Questions
Can I buy a SIM at the airport? Yes — all three major operators have booths at Hanoi, Saigon, and Da Nang airports. Prices are higher than in the city.
Is eSIM cheaper than a physical SIM?
However, not always.
Local physical SIMs are cheaper, but eSIMs are more convenient.
Additionally, for short trips (under 10 days), eSIM is often more cost-effective than buying a local SIM.
Which operator works on Phu Quoc? Viettel has the best coverage on Phu Quoc, including Hon Thom Island. Vinaphone works in most tourist areas but may be weak in remote parts.
Do I need a Vietnamese phone number? Not for most travelers. Grab works with your international number, and you can use WhatsApp or Telegram for communication.
Can I use my home SIM with roaming? However, it’s expensive. Most international roaming plans cost $5–$10 per day. A local SIM or eSIM is much cheaper.
How do I top up? Go to a convenience store (7-Eleven, Circle K) and ask for a top-up card. Scratch the card, enter the code on your phone, and the credit is added.
Final Verdict
For most travelers, Viettel is the best choice — widest coverage and reliable speeds.
If you want convenience, buy an eSIM from Airalo or Mobimatter before you go.
If you’re on a budget and have time, buy a local Viettel SIM in the city.
Additionally, this offers the best rates.
Once you’ve sorted your internet, the rest of Vietnam is waiting. Additionally, check out my detailed guides to Hon Thom Island, Sunset Town, and Grand World to start planning your trip.
Where to Stay and What to Pair It With
Once your connectivity is sorted, it’s time to book your accommodation. You’ll find everything from budget guesthouses to luxury resorts across Vietnam — check hotels in Vietnam to compare prices and read guest reviews. For a broader overview, I’ve put together guides to the best hotels on Phu Quoc, best hotels in Da Nang, and best hotels in Nha Trang if you’re still deciding where to base yourself.
Pair your trip with a visit to Ngoc Hien Pearl Farm for a unique cultural experience, or Sim Sơn Winery for a taste of Phu Quoc’s famous sim wine. For a full day of adventure, combine it with VinWonders and Safari — the park is one of the island’s top attractions.
