Bring the passport for a local SIM
Vietnam's tourism board says prepaid SIMs are sold at major airports and shops across the country, and that a passport must be shown for registration. Viettel's tourist purchase portal asks for a photograph of the passport front and a portrait photograph. Its visitor guide says the physical passport is needed at a counter and directs travellers to airport kiosks, Viettel stores or authorised points of sale. These are reasons to use an identifiable operator channel and to check that the line is registered in the traveller's own name.
Viettel describes a digital identity-check process before its tourist eSIM activates. If an airport queue is long, remember that buying a product and finishing registration are separate steps. Keep the passport accessible after immigration and make sure the phone can receive the installation instructions. The tourism board identifies Hanoi, Da Nang and Ho Chi Minh City as the main international airport arrival points, but the available operator counter and opening hours should be checked for the particular flight.
MobiFone publishes a visitor voice-and-data bundle
MobiFone's official TR109 page describes a starter package for international visitors at 109,000 Vietnamese dong for 20 days at the time of checking. It advertises 4 GB of data per day, calls within the MobiFone network under ten minutes up to a stated total, and a smaller allocation of international calls to named destinations. The package is explicitly for use where MobiFone has coverage within Vietnam. Read the current terms before purchase, because a daily allowance is different from a single data pool available whenever needed.
The same MobiFone page says TR109 does not renew automatically when its period ends. This is useful for a brief visit because it avoids assuming that a remaining phone balance keeps the bundle active, but it requires a new decision for a longer stay. MobiFone also says a newly issued prepaid eSIM is supported and lists its My MobiFone app, authorised agents and its own shops as routes for a new connection. Ask which exact tourist package can be attached to the line and confirm that the passport details have been accepted before leaving the shop.
Check the handset before changing a line
MobiFone says an eSIM QR code is tied to one device, and its guidance points customers to a shop when replacement or recovery is needed. It also lists an original passport among the identity documents for converting an existing physical MobiFone SIM to eSIM. A visitor should therefore avoid deleting a working local profile while experimenting with settings. Keep a copy of the purchase information and ask the operator how a replacement would be handled if the phone is lost or changed during the trip.
A replacement is particularly important if a local number receives booking confirmations or bank messages. Before depending on that number, ask the issuing operator how a lost or broken handset can be replaced and what identity check would be required. Keep account and purchase details separate from the phone so support can identify the line; save a second contact method for the hotel or transport provider.
Interpret national coverage with care
Vietnam's information ministry said in a November 2024 report that 99.8 per cent of the population had 4G coverage. It also acknowledged uncovered villages and plans to address them. That historical population figure is not a promise of mobile data on every mountain road, in every building or on a ferry. For an itinerary reaching beyond Hanoi, Da Nang and Ho Chi Minh City, ask the chosen operator about the specific province and route.
A traveller moving between cities may have the most difficulty precisely where live directions are valuable: at an unfamiliar bus stop, rural transfer or airport exit. Save an offline copy of the accommodation address and important booking details. If choosing MobiFone's TR109, its own page limits use to areas within MobiFone's Vietnam coverage. Check actual service after activation before leaving the arrival city, and do not infer one network's reach from another's national claim.
Set up the airport transfer before landing
The tourism board's airport guide covers arrivals through Noi Bai in Hanoi, Da Nang and Tan Son Nhat in Ho Chi Minh City, and describes app-booked rides among the transport options. Grab's own Vietnam site says its app can book rides and show an estimated pickup and drop-off route. A working connection at the arrivals area is useful for finding the designated pickup point and identifying the assigned car. Download the app and enter any necessary account details before departure, but confirm the current airport pickup instructions after landing.
For a passenger choosing a local SIM at a counter, the ride booking must wait until registration and activation are complete. A travel eSIM already installed can bridge that first connection, provided its activation conditions have been met. Save the hotel's Vietnamese address as text as well as a map pin; it remains useful when handing it to a driver if mobile data is interrupted. Treat any transport prices in older airport guides as historical rather than a current fare quotation.
Use the home line deliberately
Vietnam is outside the EU and EEA Roam Like at Home area. A visitor arriving with a European number should check the home operator's Vietnam rate or travel pass before allowing that line to use mobile data. Apple's iPhone guidance says a supported, unlocked phone can keep a home eSIM and a travel eSIM active together while the user selects which line supplies cellular data. It also warns that keeping the home line active can still result in roaming charges on that line.
Before flying, check whether the handset is carrier-unlocked; Apple says an iPhone displays No SIM Restrictions next to Carrier Lock in Settings, General, About when it is. Install a purchased eSIM using a stable connection if its provider permits early installation, and note when the validity period begins. On arrival, select the intended data line, test a website and check that the home line has not been chosen automatically for data. Keep the home number available for account codes only if its roaming costs are understood.
Keep the emergency numbers off the data line
The UK government's Vietnam travel guidance lists 113 for police, 114 for fire, 115 for ambulance and 112 for national search and rescue. It also says the emergency lines are operated in Vietnamese. Store the numbers and an accommodation address offline, and arrange language help where possible for a serious incident. The existence of a data connection does not prove that a particular eSIM includes ordinary voice calling, so check the plan's service description and keep a voice-capable line available.
The local voice component of a package such as MobiFone's TR109 is different from a data-only product. Test the intended voice line before a long overland trip rather than first discovering its limits during an emergency. Share the day's route with a trusted contact when travelling into areas where coverage has not been checked, and retain any booking reference outside an app that requires live data.
Networks our Vietnam plans use
These are the operators named on our plans for Vietnam, taken from the plan data, so the list follows the catalogue.
- MobiFone5G
- Vietnamobile4G
- Viettel5G
- Viettel Mobile5G
- Vinaphone5G
- VINAPHONE4G
- Vms MobifonLTE
- VNPT5G
- VNPT International4G