Before you start

Your original passport
A Da Nang address or hotel details
An unlocked or eSIM-capable handset
A lease and usually landlord consent for a fibre installation

Step-by-step

1
Land on a travel eSIM, then replace it
A data eSIM covers the first days while you find an address, and stops you buying whatever the arrivals hall vendor is selling. It is not a substitute for a registered line, because banks will not onboard you on it.
Mobile appWho: YouDay 1
2
Buy at a branded Viettel, VinaPhone or MobiFone store
Staff scan your passport and register the line to you via eKYC. Viettel has the widest coverage if you will ride the Hải Vân pass or head into the former Quảng Nam highlands; all three are fine along the coast. There are official stores throughout Hải Châu.
In personWho: You15–30 minutesFrom about VND 150,000
3
Verify the registration is in your name before leaving the counter
If your passport was not scanned, the line belongs to somebody else. Vietnam has blocked millions of improperly registered numbers in successive enforcement sweeps, and those are precisely the pre-activated ones sold ready to use. Ask to see the registration record.
In personWho: You
4
Add a monthly data package
Mobile data in Vietnam is cheap enough that rationing it is pointless — a generous monthly package is a few dollars. Top up through the carrier app, a bank transfer or a convenience store.
Mobile appWho: YouMinutes≈US$5–10 per month
5
Test the fibre in the actual flat before signing a lease
Da Nang fibre at 100 Mbps and above costs VND 250,000–400,000 a month and is generally excellent. But a lot of housing stock here was built for short-term letting with one shared line across several units, and the advertised speed is the building's. Run a speed test in the room you will work in, in the evening.
In personWho: You
6
Build a wet-season fallback before September
Typhoons and heavy rain take down power and overhead cabling for hours at a time, most reliably between September and December. A charged laptop, a power bank that can run a router, and a second carrier's data package on a spare eSIM is the whole mitigation — but it needs to exist before the first storm, not during it.
Mobile appWho: YouBefore September

Documents you’ll need

Original passport for SIM registration
Da Nang address or hotel details
Lease and landlord consent for fibre installation
A Vietnamese bank account or cash for the monthly fibre bill

Things most newcomers don’t know

An unregistered SIM will not receive your bank's one-time passwords.

Decree 49/2017 and the Telecom Law require carriers to record a foreigner's passport when issuing a line, and regulators have found millions of numbers registered against false or duplicated identity details and had the carriers block them. Beyond the risk of the number disappearing, a line registered to a stranger cannot be attached to a Vietnamese bank account, which blocks the whole banking chain. If nobody asked for your passport, it is the wrong SIM.

Source: Decree 49/2017 / Telecom Law

The wet season is a connectivity risk and Da Nang's remote workers plan for it.

From September to December, storms take down power and overhead cabling, and in the October 2025 flooding parts of the city were without both for extended periods while more than 65,000 households were affected. If your income depends on being online, a power bank capable of running a router, a fully charged laptop and a second carrier on a spare eSIM is a small investment against a genuinely recurring event.

Source: VietnamPlus flood reporting / community-reported

A lot of Da Nang stock has one shared fibre line split across several units.

Enormous numbers of apartments here were built for short-term tourist letting, where a single shared connection is adequate. Let long-term to a remote worker, the same building advertises fibre and delivers a fraction of it in the evening when every unit is streaming. The advertised plan is the building's, not yours. Test in the room, at 8pm, before you sign anything.

Source: community-reported

Vietnam's international bandwidth depends on a handful of fragile submarine cables.

The country's undersea cables have repeatedly failed simultaneously, and when they do, domestic traffic stays fast while anything hosted abroad — video calls, foreign cloud services, some VPNs — degrades for days or weeks. No local plan fixes it and no provider will warn you. Knowing the failure mode exists is the difference between troubleshooting your router for an afternoon and simply switching to mobile data.

Source: community-reported