Staying Connected in Vietnam: A Complete Guide to Mobile Internet, Data SIM Cards, eSIMs & WiFi

Last update: Monday September 15, 2025

Whether you're traveling to Vietnam for a short vacation, an extended backpacking trip, or remote work, having reliable internet access is crucial. From streaming from a Phu Quoc beach to negotiating the crowded streets of Hanoi, this guide lists the best options for mobile internet in Vietnam.

1. Mobile Internet in Vietnam: What You Need to Know

In Southeast Asia, Vietnam provides some of the fastest and most reasonably priced mobile internet. The nation has widespread 4G LTE coverage, and major cities are progressively implementing 5G. If you pick the right option, staying online is simple thanks to affordable data packages and robust urban infrastructure.

Below is a summary of your options: 

2. Buying a Data SIM Card in Vietnam

A local data SIM card is often the most cost-effective way to access the internet in Vietnam.

Top Mobile Operators:

• Viettel – best nationwide coverage, including rural areas

• Vinaphone – great speeds, excellent in cities

• Mobifone – solid coverage and data plans

Where to Buy:

• Airports (e.g., Hanoi, Ho Chi Minh City): Convenient but slightly more expensive

• Mobile stores or convenience shops: More affordable with local pricing

• Online delivery services: Some companies deliver SIMs to your hotel or Airbnb

What You’ll Need:

• Unlocked phone (remove the phone to install the SIM card).

• Passport (for registration, as required by Vietnamese law)

3. eSIM in Vietnam: A Hassle-Free Option

If your device is compatible, an eSIM (embedded SIM) is a fantastic substitute. For frequent travellers or digital nomads, the ability to purchase, activate, and utilise a mobile plan without a physical SIM card is ideal.

Benefits of Using eSIM:

• Instant setup—no need to find a store

• Keep your home SIM active (dual SIM)

• Avoid physical SIM swapping

Pro tips: You can read more about ESIM and how to setup at our blog 2025 Guide: Best Vietnam Tourist ESIMs With Data Plan & Phone Number

4. International Roaming in Vietnam: Is It Worth It?

International roaming is an additional choice if you would rather not switch SIMs or eSIMs. But in Vietnam, it's frequently more costly and unreliable.

Pros:

• No SIM swap needed

• Your phone number stays active

• Good for short trips or emergencies

Cons:

• Can cost $10+ per day for data

• Slower speeds or limited coverage

• Unexpected roaming charges if not pre-arranged

Pro tips: Check with your provider for roaming packages. Some carriers (like T-Mobile or Vodafone) offer discounted international roaming, but you’ll typically get better value with a local SIM or eSIM.

5. WiFi in Vietnam: Free & Widely Available

The good news: Free WiFi is everywhere in Vietnam, especially in cities and tourist hubs.

Where You’ll Find Free WiFi:

• Cafes and restaurants (coffee shops like Highlands, The Coffee House, etc.)

• Hotels and hostels

• Airports and shopping malls

• Co-working spaces (e.g., Toong, Dreamplex, CirCO)

Performance:

Although it can vary, WiFi speeds are typically respectable (20–100 Mbps in cities). In remote locations or during blackouts, it is unreliable. Instead of using it as your primary connection source, use it as a backup.

6. Final Tips for Staying Connected in Vietnam

• Unlock your phone before arriving

• Use WhatsApp, Zalo, or Facebook Messenger for local communication

• Download offline maps (Google Maps or Maps.me) in case of connection issues

• Use a VPN if you want added security on public WiFi

• Bring a power bank—Vietnamese adventures can be long and power outlets scarce

In conclusion

One of the cheapest and easiest places in Asia to stay connected is Vietnam. There are many options available to you, whether you decide to use WiFi and roaming, an eSIM for convenience, or a cheap local SIM card. Just be sure to select the one that best suits your journey.

Now, with our services, you can easily scan the QR code and added the eSIM, we kindly ask that you contact us so we can proceed with the activation on our end. This final step ensures that your eSIM will be fully functional and ready for use during your trip.

Contact us and let us know your travel plans! Whether you’re coming for leisure or business, our team is here to support you with the latest Vietnam visa updates, urgent visas, and Fast Track airport services.

• Whatsapp: +84379522522
• Hotline: +84.379.522.522
• Email: sales@vietnam-immi.org