The three networks, and why almost everyone lands on Viettel
Vietnam has three real mobile operators — Viettel (Viettel Telecom, the army-owned giant), Vinaphone (VNPT's mobile arm) and Mobifone — and together they carry roughly ninety percent of the country. In the middle of Hồ Chí Minh City or Hà Nội, honestly, all three are fine: you'll get 4G everywhere and 5G in the central districts. The moment you leave the cities, the picture changes. Viettel simply has more towers, and in the mountains — Hà Giang, Sa Pa, the karst around Phong Nha, the deep Mekong Delta — there are stretches where a Viettel signal is the *only* signal. That single fact is why most long-stayers, expats and Russian-speaking зимовщики alike, end up on Viettel regardless of price. Vinaphone and Mobifone are perfectly usable if you never leave the coast (Nha Trang, Đà Nẵng, Phú Quốc), and their city plans are competitive. But if you ride a motorbike out of town on weekends, or you're the sort who ends up in Mù Cang Chải for rice-terrace season, put Viettel in your phone and stop overthinking it. Data itself is absurdly cheap by Western standards, and unlimited-ish plans are the norm, not a splurge.
eSIM for the plane, physical SIM once you've landed
The smart play is two-stage. Before you fly, buy a tourist eSIM (Airalo, Saily and a dozen others) and have it installed but not activated — when your plane touches down and you flip on data roaming, you're online walking off the jet bridge, no queue, no airport kiosk markup. That first eSIM is worth every cent purely for the Grab ride to your apartment and the WhatsApp to your landlord. Then, within a few days, walk into a real operator shop and buy a proper physical Viettel SIM. Here's the important nuance most tourist blogs skip: an eSIM you bought *abroad* comes pre-registered by the vendor, which is convenient but also means the Vietnamese number isn't truly yours. A physical SIM bought in-country, registered against your passport, gives you a real Vietnamese phone number — and you *need* one. Grab, food delivery, banking apps, your landlord, the electricity office, the eventual home-internet contract: they all want a local number that receives SMS codes. Do not build your Vietnamese life on a rotating tourist eSIM.
Registration is real now — bring your passport, don't buy on the street
For years you could buy a pre-activated SIM from any pavement kiosk and never show ID. That era is over. Vietnam ran a hard crackdown on unverified SIMs, and enforcement is ongoing: in one 2026 sweep Viettel restricted outgoing service on over five million unverified accounts, Vinaphone suspended nearly three million, Mobifone around 2.6 million. An unregistered SIM gets progressively strangled — one-way block, then two-way, then killed inside a month. The practical takeaway: buy from an official operator shop (search 'Viettel' on Google Maps and go to an actual cửa hàng, not a random phone stall), bring your physical passport, and make sure the SIM is registered to *you* on the spot. It takes ten minutes and costs a couple of dollars. A SIM someone else registered for you — a helpful hostel owner, a market vendor — can go dark without warning and you'll have no recourse. This is the single most common way newcomers lose their number in month two.
Home internet: who arranges it, and the fibre providers that matter
The domestic fibre in Vietnam is genuinely good and cheap — 100–300 Mbps for the price of a couple of coffees a month, gigabit for not much more. Three providers dominate the wire into your wall: VNPT (largest, most reliable, the old incumbent), Viettel (fastest peaks, best coverage in newer areas) and FPT (the private tech company, and crucially the one with actual English-speaking support lines, which is why expats in Nha Trang and Đà Nẵng gravitate to it). Who sets it up depends on your rental. In a serviced apartment or a room in a house, internet is usually already installed and bundled into rent — you plug in and go. In a bare long-term lease, you arrange it, and the accepted local practice is to have your landlord put the contract in *their* name (they have the ID paperwork and the Vietnamese phone number the provider wants); you just pay. A technician typically comes within 24–48 hours of payment and the install takes under an hour. Pay attention to the money mechanics: monthly billing usually wants a deposit of 500,000–1,000,000 VND, but if you prepay six months you often get a free month, and twelve months gets you two to three months free plus a free router and free installation. For a settled year, prepaying is the obvious move.
The catch nobody mentions: domestic is fast, international is a lottery
Here is the honest, load-bearing caveat about Vietnamese internet, the one that separates people who've lived there from people who've read a listicle. Your speed test to a Vietnamese server will look glorious — 200, 300 Mbps. Your speed to servers *outside* Vietnam can, at the worst moments, be a fraction of that. The country's international traffic rides on a handful of undersea cables, the notorious AAG among them, and these cables fail two or three times a year — genuinely, sometimes because a ship's anchor drags them, sometimes (the running local joke that is half true) because something bites them. When a cable is down, your Netflix, your video calls to Europe, your git pushes and cloud backups crawl for days or weeks while it's repaired, even though YouTube-in-Vietnam and local sites stay perfect. Two defenses that experienced expats actually use: keep a good VPN (it sometimes routes you around the congested segment and, honestly, it also handles the occasional blocked site), and keep a Viettel SIM with data as a hotspot backup so a cable cut or a power blip doesn't take your whole workday down. If your income depends on stable international connectivity, treat a second connection as insurance, not luxury.
Verify the connection before you sign the lease
This is where a little skepticism saves months of misery, because a beautiful apartment with bad internet is a trap you can't easily escape once you've paid the deposit. First: run an actual speed test on your own phone, on Wi-Fi, standing inside the specific unit — not the lobby, not the agent's phone. Test to a foreign server, not just a Vietnamese one, so you see the real international figure. Second, and this genuinely surprises people: many apartment buildings and whole neighborhoods are locked to a *single* ISP through an exclusive building contract. You may love the flat and discover you can only ever have, say, VNPT at one fixed speed tier, with no option to upgrade or switch. So ask the landlord directly: which provider serves the building, what speed is the line, is it a private line to the unit or shared, and can it be upgraded? Third, Vietnamese apartments are poured concrete with steel rebar — Wi-Fi does not pass through those walls politely. A 'fast' connection at the router can be a dead zone in the bedroom. Walk the whole unit with your phone. If you work from home, budget for your own decent router and possibly a mesh point; the free ISP box (often a basic Tenda) is fine for streaming and hopeless for a three-bed apartment.
Coworking, city by city
Even with perfect home fibre, you'll want somewhere else to work — for the community, for the day the cable's down, for air conditioning that isn't your electricity bill. In Hồ Chí Minh City the scene is deepest: Dreamplex is the polished, natural-materials premium option with an on-site café and a real events calendar; The Hive in District 1 gives you six floors and a rooftop with a 360° view; and Toong, the homegrown Vietnamese chain, is the dependable Honda Civic of coworking — not flashy, solid value, and it's in every city. District 1 puts you in the thick of it; District 2 (Thảo Điền) is the leafier, expat-heavy side with its own cluster of quieter spaces. In Đà Nẵng — the digital-nomad capital of Vietnam — everything orbits the An Thượng neighborhood behind My Khe beach: Enouvo Space (now Enosta) is the perennial favorite, a coworking-plus-coliving building with a genuine community, and the newer HIVE Đà Nẵng offers sit-stand desks, dual monitors and quiet focus rooms. In An Thượng you can walk from your flat to a coworking desk, a work-friendly café, a gym and the beach inside ten minutes, which is the whole reason nomads pick Đà Nẵng. In Hà Nội, Toong and UP Coworking anchor the cheaper end while giving you the northern capital's more serious, business-district energy.
Honest tips from people who've actually lived it
A short, unglamorous checklist. Keep your phone data topped up — a hotspot has rescued more remote workdays than any coworking membership. Prepay your home fibre for the free months, but only once you're confident in the flat and the international speed. Save your provider's app early; the interface has a translate option that beats standing in a queue when your Vietnamese is nonexistent. Assume at least one multi-day international-connectivity crisis per season and don't schedule your one critical client call for the week a cable is out. Keep a backup work spot you already know and like, so a bad-internet morning is an annoyance, not a panic. Register everything — SIM and fibre — in a way that's traceable to you or a landlord you trust, because an account in a stranger's name is a landmine. And genuinely, spend the money on your own router if you work from home; it is the cheapest quality-of-life upgrade in your entire Vietnamese setup. Get the connectivity right and Vietnam is one of the easiest places on earth to live and work remotely — fast, cheap, and forgiving once you know where the potholes are.