Staying connected in Vietnam: eSIMs, local SIMs, and the VPN question

eSIM vs local SIM

Travel eSIMs (Airalo, Holafly, and similar) work on Vietnam's main networks and cost a few dollars more for maximum convenience — land, scan, go. A local SIM (Viettel, Vinaphone, Mobifone) from an official store is cheaper per gigabyte and simple if your passport is handy; airport counters charge a markup for the convenience. For a 2-week trip the difference is a few dollars — buy whichever is easier.

Coverage reality

Cities and the corridor: excellent 4G/5G. Ha Giang's remote loop sections, some Phong Nha park areas and offshore boats: patchy to none — download offline maps before the loop. Guesthouse wifi is usually fine; speeds vary wildly in the highlands.

VPN and blocked content

Most Western services work normally. Some platforms throttle or block intermittently, and Facebook/Google services occasionally degrade around political events. If you need reliable access to work tools, install a VPN before arrival.

FAQ

How much data do I need for 2 weeks in Vietnam?

Map-heavy independent travel plus messaging runs roughly 2–5 GB/week. A 15–20 GB plan covers generous use including video calls.

Can I use my home SIM with roaming?

Technically yes; economically it is usually the worst option. Even a travel eSIM beats typical home roaming rates.