Vietnam eSIM for 30 days: for living there, not just visiting

How much data 30 days in Vietnam takes

What a month in Vietnam looks like

A month in Vietnam for a Thai traveller usually takes one of three shapes: remote work from a beach city such as Da Nang, a language or short course in Hanoi or Ho Chi Minh City, or a stay with family and friends. A month differs from a holiday in that you have a fixed home, fixed Wi-Fi and a repeated routine, with the occasional weekend away.

So the estimate needs a different mindset from a short trip. The normal 31 GB is 900 MB a day times thirty with a margin, but in real life, with stable home Wi-Fi, mobile data falls to what you use outside and when Wi-Fi fails. If you work by tethering from your phone, the number climbs well past the heavy figure.

Mobile data across the month

• First week: new place, hunting for supermarkets, markets and laundry, so maps and Grab are heaviest. After that you know the way and usage drops.
• Workdays: if the home or café Wi-Fi holds, mobile data is only the backup for video calls when power or the network fails.
• Weekend trips: Hoi An, Hue or the hills are heavy-use days with changing signal, behaving like a short trip.
• Last week: flights, shipping things home and checking out use more mobile data than you expect.

Which plan fits thirty days

This is the length where the Vietnam 30-day fixed plans match exactly, at 3, 5, 10 and 20 GB, with the 50 GB 180-day plan as the largest. If home Wi-Fi is your mainstay, 20 GB is plenty, because you use mobile only when out. If mobile data is your main connection, the normal 31 GB exceeds 20 GB, the largest 30-day plan, so the 50 GB, 180-day plan is the one to consider: its validity runs well beyond the stay, but it is the single pack that covers normal use with room to spare.

Daily plans suit a long month when mobile usage is steady. The drawbacks are that you buy all thirty days, nothing rolls over, and if the daily size is too small a heavy workday gets throttled. If you work seriously over mobile data, choose a version with a higher post-allowance speed or a larger daily size.

Facts for long stays and a local number

Over a month, services tied to a Vietnamese number begin to appear. Local e-wallets, food delivery and some identity checks often want a local number and sometimes a Vietnamese bank account. Our eSIM is data only with no number. If you need those services, buy a Vietnamese SIM and register it with your passport under the operator's rules, then keep the eSIM as a backup data line. Check the current rules with the operator directly.

On networks, the Vietnam plans run on Viettel Mobile, MobiFone and Vinaphone, the main operators in the country. If you move between cities within the month, you do not change plans. A long stay also means testing the home Wi-Fi before paying in advance, and having a fallback for when it fails.