Vietnam isn't a one-week country
You can do Vietnam in seven days if you're willing to fly between Hanoi, Hue, and Ho Chi Minh City and check off three places. Most travelers don't, because Hanoi alone is a week if you let it be, and Ha Long Bay is two days minimum, and Hoi An is the kind of town that pulls people for a month. The country runs 3,000 km of coastline; trips here stretch.
Roamzy charges $3.07 per gigabyte in Vietnam, which is $0.0030 per megabyte. Real-time billing on actual usage. No expiry on the balance. No reset. No subscription you forgot to cancel. One per-MB rate across 192 countries — the same on day three as on day sixty-five.
How much does Roamzy cost over a long stay?
Take 1 GB/day as a realistic average. Cafés and hostels handle most indoor load on Wi-Fi; cellular is for Grab, the street, and long bus or train days:
| Trip length | Roamzy ($3.07/GB) | Local tourist SIM (re-bought) | Roaming on home number |
|---|---|---|---|
| 2 weeks (14 GB) | $42.99 | $15–40 (8-day pack + top-up) | $80–180 ($5–13/day) |
| 1 month (30 GB) | $92.16 | $30–70 (two packs, mismatched windows) | $200–400 |
| 2 months (60 GB) | $184.32 | $60–140 (three to four packs back-to-back) | not realistic |
Competitor prices in columns 3 and 4 are 2025 ranges based on typical offerings; exact figures depend on your home carrier and the airport store you visit. Roamzy's rate in column 2 is our actual published rate from the pricing page.
A local Vietnamese SIM in HAN or SGN looks cheap up front. Tourist packs reset the balance, force re-registration each time, and sometimes split the country into "north" and "south" tariffs in ways foreigners don't read. Three months in Vietnam is four or five SIMs. Roamzy has one rate — same for three days, same for three months.
What matters on a long trail?
- Hostel Wi-Fi varies wildly. Hanoi and HCMC are usually fine. Phong Nha, Cat Ba, Phu Quoc — networks slow at night when everyone's on. Cellular goes from backup to primary.
- Grab is the universal interface. Cabs without meters are common; the app neutralizes that. Be is the local alternative.
- Zalo, not WhatsApp. Vietnamese contacts — guides, hosts, motorbike rentals — often live in Zalo.
- The night trains and sleeper buses. Reunification Express Hanoi–HCMC, Hanoi–Sapa, sleeper to Hue — signal works near towns, drops on long mountain stretches.
- Camera translator earns its keep on Vietnamese signage — most menus in tourist zones have English, but pharmacy shelves, ticket booths, and rural restaurants often don't.
A monthly data budget shapes up: maps ~5 GB, translator ~2 GB, messaging and home calls ~8 GB, Grab ~1 GB, photos and bookings ~10 GB, OS background ~4 GB. That's the 30 GB month.
Where does Roamzy work in this country?
- Hanoi, Ho Chi Minh City, Da Nang, Hai Phong, Can Tho — 5G in the centers, solid LTE around them
- Hoi An, Hue, Nha Trang — strong LTE through tourist zones
- Sapa, Ha Giang, the northern mountains — workable LTE in the towns; the Ha Giang loop drops signal for 30+ minutes at a stretch on the high passes
- Ha Long Bay and Cat Ba — solid in the towns and at the piers; on the bay itself signal weakens past 2 km from shore
- Phu Quoc and Con Dao — workable in the resort zones; remote beaches drop
- Mekong Delta — workable in towns, weaker on the boat trips
- Phong Nha caves — town has signal; inside the caves, none
How do I install my Roamzy eSIM?
| Plug type | Voltage | Frequency | iOS | Android |
|---|---|---|---|---|
| Type A, C, F | 220 V | 50 Hz | iPhone XS+ | Pixel 3+, Galaxy S20+ |
- Sign in to Roamzy via Telegram or Google
- Top up the eSIM with a minimum of 20 USDT — stablecoins, no cards, no banks, no FX surcharges
- The QR code appears in the dashboard once payment confirms
- Settings → Cellular → Add eSIM → scan QR (do this before you fly)
- The counter starts the moment you land at HAN, SGN, DAD, or any other gateway
Supported stablecoins, networks, and common iPhone/Android setup errors are in the FAQ.
What are Roamzy's honest limitations?
Long-trip travelers historically lose money to three things. Roamzy doesn't close those traps — they don't exist in the product.
- No expiry on the balance. Loaded $50, used $14 on the first trip — the rest waits for the next one.
- No auto-renewal. When the balance runs out, the eSIM stops. No background charge to a card.
- No throttling. One rate. The first GB and the hundredth cost the same $0.0030/MB.
That's the engineering consequence of selling bytes instead of packages. You can't price below this without re-introducing the small print, so we don't.
What if the trail continues across borders?
A long Southeast Asia route is the norm:
- Thailand — overland via Cambodia or by air, separate country rate
- Cambodia — the Moc Bai border or by air to Phnom Penh
- Laos — common northern continuation through Sapa or by flight
- China — overland from Sapa to Lao Cai is a classic Yunnan crossing
- If you want context — how roaming pricing actually works