Disclaimer: The prices and information presented on this page reflect a snapshot at the time of research and may change at any time without prior notice.
Aisha
06 March 2026
Australia sends more than 400,000 visitors to Vietnam every year, and a significant number of them are Telstra customers who land in Ho Chi Minh City or Hanoi expecting their roaming to work without a fuss. It usually does. But there are a few details about Telstra's Vietnam roaming setup that catch people out, particularly the AEST midnight reset on non-Upfront plans, the 2 GB daily data cap on Zone 2 Day Passes, and what happens when you leave the city and head into rural areas where local network conditions are more variable. This guide covers how Telstra roaming works in Vietnam, what it costs, and when swapping to a local travel eSIM makes more sense for the duration of your trip.
Vietnam sits in Telstra's Zone 2 for international roaming. That means customers on Upfront Telstra mobile plans can use the International Roaming Day Pass in Vietnam, which provides 2 GB of data per day plus unlimited calls and SMS to standard numbers, charged at the Zone 2 Day Pass rate. The Day Pass is triggered automatically the first time you use your service in Vietnam: making or receiving a call, sending an SMS, or using any mobile data. Once triggered, you are billed for that full day regardless of whether you turn roaming off before the 24 hours are up.
The key structural detail is how the day resets. For customers on Upfront Telstra plans, the Day Pass runs for 24 hours from first use. For customers on Non-Upfront plans, the day resets at 11:59 PM AEST, which is 8:59 PM Vietnam time during Australian Eastern Standard Time, or 9:59 PM during AEDT (daylight saving). That means an evening flight from Sydney that lands in Ho Chi Minh City at, say, 10 PM Vietnam time could trigger a Day Pass charge that expires less than two hours later, immediately triggering a second charge for the next AEST day. It is worth checking which plan type you are on before you travel.
Vietnam is not eligible for Telstra's Prepaid International Roaming Packs, which cover 38 countries but do not include Vietnam. Prepaid Telstra customers without an Upfront plan who want to roam in Vietnam should check current pay-as-you-go rates in the My Telstra app, as PAYG charges in Zone 2 destinations can be substantially higher than the Day Pass rate.
Research: March 2026. Pricing and zone classification subject to change. Check the My Telstra app for your current plan's applicable rates before travel.
Enable Day Pass in the My Telstra app before you fly. If you are on an Upfront plan, verify that International Roaming and the Day Pass are both activated on your service. The Day Pass is on by default for most Upfront plan holders, but if you have previously turned it off, you will need to reactivate it. Do not rely on airport Wi-Fi to do this once you have landed.
Know your plan type before you board. Whether you are on an Upfront or Non-Upfront plan determines how your AEST day reset works. Log into My Telstra and confirm this before your trip. If you are on a Non-Upfront plan and your flight arrives in Vietnam in the evening, you may want to keep data off until after the AEST midnight reset to avoid triggering two Day Pass charges in quick succession.
Turn off background data on arrival. The Day Pass activates automatically the moment your phone uses data, including background sync from apps. Put your phone into Airplane Mode during the flight and switch to Roaming mode once landed rather than letting background apps trigger your Day Pass the moment you connect to a local network.
2 GB per day fills up quickly in Vietnam. Google Maps navigation with real-time traffic, Google Translate camera mode for reading menus, and casual Instagram use can collectively burn through 500 MB to 1 GB in an active sightseeing day. If you are using video calls or streaming on transport between cities, the 2 GB cap will not last a full day. Top-up via the My Telstra app for an additional $10 per 2 GB.
MMS and video calls are not included. The Day Pass covers standard calls and SMS only. MMS, video calls, and calls to premium or satellite numbers are charged at separate PAYG rates. Stick to WhatsApp video calls for any video communication while in Vietnam.
Monitor usage via SMS alerts. Telstra sends SMS notifications when you have used 50%, 85%, and 100% of your daily 2 GB allowance. These are free to receive and worth tracking, especially on high-usage days.
For a short trip to Vietnam, three to five days staying in Ho Chi Minh City or Hanoi, Telstra's Zone 2 Day Pass is a straightforward option. You keep your Australian number, you can receive calls from home, and 2 GB per day is adequate for moderate usage in a city where hotel and cafe Wi-Fi is widely available.
A dedicated travel eSIM starts to make more economic sense as the trip extends or the itinerary diversifies. Ten days of Telstra Zone 2 Day Passes adds up to a meaningful cost, and the 2 GB daily cap becomes more constraining when you are navigating between Hoi An's backstreets and Hue's temples without reliable Wi-Fi. A Vietnam eSIM plan covering the full trip duration typically provides more total data at a lower total price than stacking individual Day Passes. For travellers who combine Vietnam with another country on the same trip, an eSIM with multi-country or consecutive single-country plans can be more efficient than purchasing separate Day Passes for each destination. The Dual-SIM approach is also practical here: an eSIM handles local data in Vietnam while the Telstra physical SIM stays active in the background for Australian number availability, so family or colleagues can still reach you on your regular number without triggering your Day Pass every time.
Vietnam has quietly become one of Australia's most popular long-haul destinations, and the nature of a typical Australian Vietnam trip is exactly what stresses Telstra roaming to its limits. Australians tend to travel Vietnam for two to three weeks, moving between Hanoi, Ha Long Bay, Da Nang, Hoi An, and Ho Chi Minh City over the course of the trip. Every leg of that journey involves navigation, translation apps, booking local transport, and sharing photos in real time. Two gigabytes per AEST day does not go far in that context, particularly once you factor in the AEST reset, which in Vietnam's time zone means your daily data allocation ends at 8:59 PM local time during AEST, just as the evening is getting started.
Vietnam's local network infrastructure is genuinely impressive by international standards. Viettel ranked third globally for mobile network speed in Ookla's 2025 rankings, and VinaPhone's 5G network was ranked second in the world for 5G speed. A TurkSIM eSIM for Vietnam runs on these local networks directly, without the overhead of international roaming agreements. In practice, that means faster speeds in cities and better rural coverage across the Mekong Delta, the northern highlands near Sapa, and coastal areas between major cities. The eSIM is installed via QR code before departure and activates automatically when you land, no airport SIM hunt required.
For Australian travellers combining Vietnam with another country on the same trip, say Thailand before or Cambodia after, the eSIM approach is also more cost-efficient. Each country gets its own dedicated plan, and the Telstra physical SIM stays active for Australian number availability throughout. Family back in Sydney can still call on the familiar number. Banking apps that require Australian mobile OTPs continue to function. The travel eSIM simply handles the data layer, at local rates, for the duration of each country leg.
Yes. Vietnam is a Zone 2 destination for Telstra International Roaming Day Pass. Customers on eligible Upfront Telstra plans can use the Day Pass in Vietnam, which includes 2 GB of data and unlimited calls and SMS to standard numbers. Prepaid Telstra International Roaming Packs do not cover Vietnam, so prepaid customers should check pay-as-you-go rates in the My Telstra app.
Vietnam falls in Telstra's Zone 2, which carries a specific Day Pass rate. The exact charge depends on your current Telstra plan. Check the My Telstra app or telstra.com.au for the rate applicable to your specific plan, as charges vary between plan types and may have changed since this guide was written (March 2026).
Non-Upfront Telstra plans reset their Day Pass validity at 11:59 PM AEST. Vietnam is in the Indochina Time zone, which is 3 hours ahead of AEST and 2 hours ahead of AEDT during Australian daylight saving. So the AEST day reset arrives at 8:59 PM Vietnam time in winter and 9:59 PM in summer. Upfront plans reset 24 hours from first use, which avoids this issue.
Vietnam's major tourist areas, including Phu Quoc island and Ha Long Bay, are covered by local operators. Coverage quality on the water or in remote island locations can vary. Telstra's roaming partners in Vietnam include local operators with reasonable coastal and island coverage in popular resort zones. In more remote areas, signal may be limited regardless of carrier.
Telstra's Prepaid International Roaming Packs cover 38 countries, and Vietnam is not currently on that list. Prepaid customers travelling to Vietnam should check their pay-as-you-go international roaming rates in the My Telstra app before travelling. PAYG data charges in Zone 2 are significantly higher than Day Pass rates.
For a typical week in Vietnam covering a few cities, expect to use between 1 and 3 GB per active sightseeing day depending on navigation use, app usage, and photo uploads. A week of moderate-to-heavy use typically requires 10 to 20 GB total. Telstra's 2 GB daily cap on the Zone 2 Day Pass may be sufficient for light users but will be limiting for anyone navigating constantly or using video calls.
Also on our blog - more Telstra roaming guides:
