country-guides

Best eSIM for Vietnam in 2026: Hanoi, Ho Chi Minh, Hoi An, Phu Quoc

Viettel vs Vinaphone vs MobiFone coverage, real-world speeds on a sleeper train, and how much a Vietnam loop actually costs in data.

MobileXY Team · May 18, 2026 · 5 min read

Vietnam has some of the cheapest mobile data in the world — a local SIM is $5 for 30 GB. An eSIM bought online is comparable in price and saves the airport queue. Coverage is strong everywhere a tourist would go.

How much data?

4-day Hanoi + Halong: 2-3 GB.
10-day classic north-to-south (Hanoi → Hoi An → HCMC): 6-10 GB.
3-week Vietnam loop with Phu Quoc + Mekong Delta: 15-20 GB.

Coverage you should expect

Hanoi, Ho Chi Minh City: Strong 4G across all carriers. 5G rolled out in District 1 / Old Quarter / Hoan Kiem since 2023.
Da Nang, Hoi An, Hue: Continuous 4G — Ba Na Hills cable car holds signal end to end.
Halong Bay cruise: Decent 4G near Halong City; weak signal once you're deep in the bay. Plan to lose 4G for an afternoon and reconnect at sunset moorings.
Phu Quoc Island: 4G at the resorts and Duong Dong. Beach restaurants on the south end (Sao Beach) often drop to LTE.
Sapa, Ha Giang loop: 4G in the towns; expect dead zones between villages in the mountains.
Sleeper train (Reunification Express): 4G near cities; the long stretches through Quang Binh and Quang Tri have spotty signal.

Vietnam-only or Southeast Asia?

If you're combining Vietnam with Thailand, Cambodia, or Laos in one trip, the Asia regional eSIM saves you swapping plans at each land border. For Vietnam-only, the country plan is cheaper.