Should You Turn On Data Roaming When Landing in Vietnam?

Introduction

Upon arriving in Vietnam, many travelers wonder whether to activate data roaming on their mobile phones. The short answer, in most cases, is no. While data roaming can provide immediate internet access, it is frequently the most costly method for staying connected internationally. This article will delve into the specifics of data roaming in Vietnam, outlining what happens when you enable it, the potential expenses involved, and more economical alternatives available to ensure you remain connected throughout your journey.

Understanding Data Roaming

Data roaming allows your home mobile service to extend its reach by connecting to partner networks in Vietnam. This means your phone can access the internet, make calls, and send texts using your existing SIM card and phone number, even though you are outside your home country. This convenience, however, often comes with a significant price tag.

Generally, data roaming operates in two primary ways:

• Pay-as-you-go: This is typically the most expensive option, where you are charged per megabyte (MB) of data used. Without a pre-arranged plan, even minimal usage can lead to substantial bills.
• Pre-purchased roaming plan: Some home carriers offer international roaming packages that include a set amount of data, calls, or texts for a fixed period. While these plans are usually more affordable than pay-as-you-go rates, they can still be more expensive than local options.

If you have not specifically arranged an international roaming plan with your home carrier before your trip, it is generally advisable to keep data roaming disabled, even for brief stops or layovers.

The High Costs of Data Roaming in Vietnam

The cost of data roaming varies significantly based on your home carrier and whether you have an active international plan. Without a dedicated roaming plan, per-MB charges can be exceptionally high. For instance, some US carriers like AT&T and Verizon have charged approximately $2.05 per MB for data usage in Vietnam without a plan. Similarly, Australian carriers like Telstra and Optus have rates ranging from $5-10 AUD per MB, while some European carriers may charge premium rates.

To illustrate the potential expenses, consider the following approximate costs for common activities without a roaming plan, assuming a rate of $10-15 per MB:

• Streaming a 10-minute YouTube video (50-100 MB): $50-150
• Checking email for 30 minutes (20-50 MB): $200-750
• Scrolling social media for 30 minutes (30-80 MB): $300-1,200
• Using Google Maps navigation for 1 hour (5-20 MB): $50-300
• A 15-minute video call (50-150 MB): $500-2,250
• One typical day of casual use (200-500 MB): $2,000-7,500

Even with daily roaming passes, such as AT&T's International Day Pass or Verizon's TravelPass, which typically cost around $12 per day, a week-long trip could still accumulate charges of $70-105. Other carriers, like Vodafone in Europe, may offer daily roaming extras for around €6 per day, though Vietnam is often excluded from standard EU roaming benefits. Japanese carriers like NTT Docomo have daily plans ranging from approximately $13-20 USD, and South Korean carriers offer plans around $7-11 USD per day.

When Data Roaming Might Be Considered

While data roaming is often not the most cost-effective solution, there are specific situations where it might be a practical choice:

• Pre-purchased International Roaming Plan: If you have already bought an international roaming plan from your home carrier that specifically covers Vietnam, and you are aware of its terms and costs.
• Short Layover or Business Trip: For very brief stays or business trips where immediate, minimal data access is required for only a few hours, and the cost is not a primary concern.
• Emergency Situations: In an emergency where maintaining your primary phone number's connectivity is critical.
• Company-Sponsored Expenses: If your employer covers all international data expenses for your trip.

In these specific scenarios, it's still recommended to verify the details of any roaming package with your carrier before traveling.

When to Avoid Data Roaming

In most other circumstances, it is advisable to keep data roaming turned off, particularly if:

• Your trip to Vietnam extends beyond a few days.
• You have not thoroughly checked your home carrier's specific roaming rates for Vietnam. It is safer to keep roaming off until you can confirm the costs.
• You are a budget-conscious traveler looking to minimize expenses.
• You have already set up a local data solution, such as a Vietnam eSIM, for your connectivity needs.
• You are traveling with family or a group, as roaming costs can quickly multiply for multiple devices.
• You prefer to rely on free Wi-Fi or other local data options.

Accidentally leaving data roaming on can result in unexpected and significant charges on your bill.

How to Disable Data Roaming on Your Phone

To prevent unwanted roaming charges, ensure data roaming is turned off on your device:

On iPhone:

1. Open the Settings app.
2. Tap on Cellular (or Mobile Data).
3. Select Cellular Data Options.
4. Toggle Data Roaming to the off position.

On Android:

1. Go to Settings.
2. Tap on Network & Internet (or Connections, depending on your device).
3. Select SIMs (or Mobile Network).
4. Choose your primary SIM card.
5. Toggle Data Roaming to the off position.

If you are using a dual SIM setup, such as your home physical SIM and a Vietnam eSIM, ensure that only the eSIM is configured for mobile data usage to avoid accidental roaming charges on your home number.

What to Do If You Accidentally Left Roaming On

If you discover that you inadvertently left data roaming enabled, take these steps immediately:

1. Turn off data roaming on your phone as described above.
2. Check your carrier's mobile app or online account to monitor your data usage and potential charges.
3. Contact your home carrier's customer service to explain the situation. Some carriers may offer a one-time adjustment or credit for accidental roaming charges, particularly if the usage was minimal.
4. Consider switching to a local eSIM plan for the remainder of your trip to manage your connectivity costs effectively.

Better Alternatives to Data Roaming in Vietnam

Instead of incurring high roaming rates, several more practical and cost-effective options are available for staying connected in Vietnam.

eSIM Plans for Vietnam

eSIMs offer a convenient and budget-friendly solution for travelers. An eSIM is a digital SIM that allows you to activate a cellular plan from a local provider without needing a physical SIM card. You can purchase and install an eSIM before your arrival, and it activates upon connecting to the local network in Vietnam, providing instant data access without roaming fees. For more detailed information, refer to our Vietnam eSIM Guide.

As of September 19, 2026, there are 96 available eSIM plans for Vietnam. These plans vary in data allowance, duration, and network coverage. For example, some plans offer daily data allowances, while others provide a total data allowance for the plan's duration. Many plans support 4G and 5G technologies.

Here are some representative eSIM plans for Vietnam, with prices in USD, though prices and availability can change:

• Daily Data Plans:
  • A 1-day plan with 500 MB per day, operating on Vietnamobile and Vinaphone networks, costs $1.13. After 500 MB, speed is reduced to 128 Kbps. (View Plan)
  • A 3-day plan with 500 MB per day, also on Vietnamobile and Vinaphone, costs $3.78. Speed reduces to 128 Kbps after the daily allowance. (View Plan)
  • A 5-day plan with 5 GB per day on Mobifone (Skyfi) costs $3.37. (View Plan)
  • A 7-day plan with 5 GB per day on Viettel costs $6.83. (View Plan)
• Total Data Plans:
  • A 3-day plan with 3 GB total data, on Vietnamobile and Vinaphone, costs $5.04. Speed reduces to 128 Kbps after the total allowance. (View Plan)
  • A 5-day plan with 3 GB total data, on Vietnamobile and Vinaphone, costs $5.46. Speed reduces to 128 Kbps after the total allowance. (View Plan)
• Unlimited Data Plans (with Fair Use Policy):
  • A 1-day plan with unlimited data, operating on Vietnamobile and Vinaphone, costs $4.55. This plan includes 2 GB of high-speed data per day, after which speed is reduced to 5 Mbps. (View Plan)
  • A 3-day plan with unlimited data on Wintel (Vinaphone) costs $2.94. This plan offers 6 GB of high-speed data per day, with speed reduced to 5 Mbps afterward. This plan also lists a voice number. (View Plan)
  • A 30-day plan with unlimited data on Wintel (Vinaphone) costs $10.30, offering 6 GB of high-speed data per day before speed reduction to 5 Mbps. This plan also lists a voice number. (View Plan)

All listed eSIM plans activate upon the first network connection at the destination. These options provide strong nationwide coverage through various local carriers, offering excellent value for your trip compared to traditional roaming.

Local Physical SIM Cards

Another alternative is to purchase a physical SIM card upon arrival in Vietnam. These are available at airports, mobile shops, and convenience stores. However, a key requirement for purchasing a local SIM card is presenting your physical passport for registration, as mandated by local regulations. This option is suitable if your device is not eSIM-compatible or if you prefer having a physical SIM as a backup. For more information on this process, consult our guide on Passport and Photo Requirements for Buying SIM Cards at Vietnam Airports.

Free Wi-Fi

Free Wi-Fi is widely available throughout Vietnam in various locations such as hotels, cafes, airports, and shopping centers. This can be a good solution for travelers with light internet usage needs or those who only require occasional access. However, it's important to be aware that public Wi-Fi networks may not always be secure, making them less ideal for sensitive transactions or accessing personal data. For more details on airport Wi-Fi, see our guide on Staying Connected: A Traveler's Guide to Vietnam Airport WiFi and eSIMs.