Vietnam is one of the busiest travel destinations in the world. Because of that, travellers often wonder whether they should go with an eSIM, a local SIM, or Wi-Fi for connectivity there. The short answer is that no single option is right for every trip, when staying connected in Vietnam. The key to the right connection is to consider the duration of your stay, where you choose to go, and what you do online.
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What Vietnam actually looks like on a phone
In 2025, Vietnam welcomed a record number of 21.2 million foreign tourists, a significant increase of over 20% compared to the previous year. That crowd is landing on a mobile network that is changing fast. By the end of 2025, commercial 5G coverage will exceed 90% of the population, with Viettel having exceeded its 20,000 new 5G sites goal. VNPT and MobiFone are not far behind.
In Ho Chi Minh City, Hanoi, Da Nang and most of the tourist coast, mobile speeds are actually fast. Once you’re inside the Central Highlands, the far north near Ha Giang or the Mekong Delta back roads, you’ll switch to 4G or lower depending on the closest tower. That distinction is more important than the eSIM brand you have.
Why this is harder than it looks for any foreign eSIM
A foreign travel eSIM is basically a roaming plan. Your phone connects to a Vietnamese cell tower, but the data has to travel through the eSIM company’s own network first before coming back to you. That extra step adds a small delay to everything you do online, and it only works when the eSIM company has an agreement with a local Vietnamese carrier.
Vietnam’s mobile networks are also still shifting under the surface. The government keeps handing out new 5G frequencies, and each carrier uses a different mix of them. When industry analysts describe Vietnam’s 5G push as one of the most aggressive in the region, they’re also describing a network that is still being built out in real time. Add the international routing on top of that, and a foreign eSIM can feel fast in Hanoi at 6 pm and just okay in Da Nang at 11 am, even from the same company.
This affects the whole eSIM industry, not one particular company. Even Hanoi’s Noi Bai airport went through stretches in late 2024 and early 2025 when several international eSIM providers were showing up with less signal than travellers were expecting during the busiest arrival hours.
Option A: The local SIM
If you’re staying for a longer period, you’ll want to use a prepaid Vietnamese SIM for staying connected in Vietnam. In Hanoi and Ho Chi Minh City, you can buy a tourist package from Viettel, Vinaphone and MobiFone at the official stores and kiosks at the airport. Data rates are very affordable by Western standards, and 30-day plans can cost between $10 and $15 with large amounts of data and local calls.
Vietnamese law mandates that you provide an original passport for registration and a photo of both the passport and your face. The counter clerk types it into the national database and it’s done in about ten minutes. This pays off on a 2-week trip or so when the low price and lower latency become important. Not quite as attractive for a short visit, or for a multi-country Southeast Asia tour where you’d prefer not to go through the procedure at each border crossing.
Option B: hotel and cafe Wi-Fi
Wi-Fi is everywhere in Vietnam. Coffee shops, hostels, mid-range hotels, and even long-distance sleeper buses advertise free Wi-Fi as a standard feature. It’s safe to connect to it for casual browsing, WhatsApp calls, and streaming the news back home.
Be extremely careful with accessing sensitive information when staying connected in Vietnam and always use a VPN. Hotel networks share a single fixed line among every guest on the property. Cafe networks are open, unencrypted, and shared with anyone else in the room. Neither is a good place for online banking, remote work involving client data, or logging into a corporate portal. Wi-Fi is a decent backup for the price. It’s not a plan for the parts of your day that actually depend on the connection.
Option C: The travel eSIM
A travel eSIM is the middle ground. You install it through an app before you fly, and the profile activates the moment you land in Vietnam. There is no SIM store visit, no passport photo, no plastic card to buy at each border.
Speeds depend on which Vietnamese carrier your provider partners with and which cell you happen to be sitting under. In the major cities, a travel eSIM can hold current-generation mobile speeds throughout the day. In more rural parts of the country, expect speeds to drop to 4G or older. The closest cell tower sets the limit for every phone on it, not just yours. For a trip of about a week to a month, you should stick with an eSIM.
Where Saily fits in
Saily is one of the travel eSIMs that lines up well with a Vietnam trip, largely because it is built around the convenience side of the tradeoff rather than trying to compete with local carriers on raw speed.
When travellers use Saily, they can connect to local 4G and 5G networks through well-known mobile network operators in each destination. This way, they don’t have to worry about managing roaming agreements. The plans offer connections through 3G, 4G, LTE, and 5G. The speed depends on the network in each location. That means that in Hanoi and Ho Chi Minh City, you can use modern cell phone speeds for most of the day. If you’re in more remote areas, the local carrier and the individual tower set the experience as they would for any other phone.
The installation process takes only a couple of minutes via the app before leaving and the profile activates upon arrival at the destination. Saily also provides 24/7 customer support in the app. You get access to responsive help teams that have received user reviews with consistent praises. That matters more than most travellers expect until the moment they actually need it.
Match the option to the trip
If you’re staying in Ho Chi Minh City for two days, you should get a travel eSIM before you fly and you’re settled. If you’re spending two weeks across the country, know that an eSIM handles most of it. You can pick up a local SIM once you settle in for the beach week. Neither option wins in every part of Vietnam. Match the tool to the trip, and treat Wi-Fi at the hotel as a backup rather than a plan.
