Hoi An old town at dusk with paper lanterns over the river, clay model
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Turn on your eSIM in Vietnam

Short answer

When you land in Vietnam, turn the VietSIM line on and choose it for mobile data. Turn off data roaming on your home SIM so it cannot run up charges. Install the eSIM within 30 days of buying it from us; if your trip starts later than that, write to us first.

Last checked:

On iPhone

  1. Open Settings, then Cellular.
  2. Tap the VietSIM line and make sure Turn On This Line is on.
  3. Go back, tap Cellular Data and choose the VietSIM line.
  4. Turn off Allow Cellular Data Switching, so the phone never falls back to your home line for data.
  5. Tap your home line and turn off Data Roaming. You can still receive calls and SMS on your home number, charged by your home carrier.

On Android

  1. Open the SIM settings: Settings, Connections, SIM manager on Samsung, or Settings, Network & internet, SIMs on Google Pixel.
  2. Turn the VietSIM eSIM on.
  3. Set Mobile data to the VietSIM eSIM.
  4. Open your home SIM and turn off Roaming.

Give the phone a few minutes to find the network. The signal bars and the carrier name, for example Viettel, VinaPhone or MobiFone, appear next to the eSIM line.

Data roaming on the eSIM line

Some eSIM profiles connect only when Data Roaming is on for that line. If the eSIM shows a signal but mobile data does not work, turn Data Roaming on for the VietSIM line only. The plan is prepaid, so this cannot add charges to the eSIM.

Install within 30 days

Every eSIM we sell can be installed within 30 days of purchase. If your trip starts more than 30 days after you buy, write to contact@vietsim.com before installing and we will confirm when the validity days start for your plan.

Identity checks

Vietnamese law requires mobile lines to be registered to an identified user. If the carrier asks for identity details to keep the line active, the line may be suspended until you provide them. We tell you by email what is needed.

Still no connection

Work through the checks in eSIM not connecting, in order.