Why eSIM is more convenient than a local SIM
Local SIMs in Vietnam are sold with passport registration, and there are often queues at airport counters. eSIM can be installed in advance and works immediately after landing — you can call Grab and open maps.
Data volume
For a week of vacation with maps and messengers, 3-5 GB is usually enough. For remote work from Da Nang or Ho Chi Minh City, choose more or an unlimited plan.
Coverage
4G works reliably in cities and resorts. In the northern mountains (Sapa, Ha Giang), service may be weaker.