eSIM for Vietnam: Hanoi, Ha Long Bay & the Coast

Vietnam moves fast, and you will keep up through your phone — Grab bikes weaving through Hanoi traffic, translating a street-food menu, and booking the next sleeper train. Here is the real coverage picture.

The networks

Vietnam's carriers are Viettel, Vinaphone, and Mobifone. Viettel has the widest, strongest coverage by a clear margin — the military-run network reaches deep into rural areas. A travel eSIM typically connects you to fast 4G.

Hanoi & Ho Chi Minh City: Blanket 4G/5G. The Old Quarter, District 1, the ride-hailing apps — all fully covered.

Ha Long Bay: Good coverage near shore and at the harbour; on an overnight cruise among the karst islands, expect signal to come and go. Enjoy the view — upload when you dock.

Hoi An, Da Nang, Hue, the coast: Full 4G in the towns and along the main routes.

The mountains (Sapa, Ha Giang): Viettel holds up surprisingly well in the highlands, though remote passes have gaps. Download offline maps for a motorbike loop.

Why an eSIM beats the airport SIM

Yes, cheap SIMs are sold at the airport — but it means a queue, your passport, and a hard-sell after a long flight. An eSIM installed at home means you land, switch it on, and book your Grab before leaving the terminal. Keep your home SIM in for your number.

How much data?

• One week: 5–8 GB.
• Two–three weeks (north to south): 10–15 GB.
• Heavy user / hotspot: 20 GB+ or unlimited-style.

Land ready to navigate the chaos. Get your Vietnam eSIM and travel connected.