Switch your Malaysia eSIM on when you land
- Line on
- Mobile data on the eSIM
- Roaming only if needed
The short answer
Once you have landed, switch the eSIM line on and give it the mobile data role. When data will not start, switch data roaming on for that line and try once more. On your home line, leave data roaming off so no charges can build up.
Checked October 2, 2026
On the eSIM line
Switch the line on and give it the mobile data role (on an iPhone, that item is Cellular Data). When data will not start, switch data roaming on for the eSIM line and try once more. Disable the setting that moves mobile data between lines, so nothing falls back to your home line.
On your home line
On your usual SIM, make sure data roaming is off. The line can stay on for calls and texts to your number; your home carrier bills those.
Give it a minute
The phone needs a minute or two to pick up the network. The signal bars and the network’s name appear next to the eSIM line: one of Malaysia’s networks, Maxis, CelcomDigi or U Mobile.
If it fails (Switch it on after landing)
Run the not connecting checks in their order. The install is due within 30 days of the purchase; when the trip starts after that window, ask the store’s support first.
More help
Install your Malaysia eSIM at home, before you fly
Scan the QR code from your order page at home on Wi-Fi, within 30 days of buying, and keep the line off until you land. How to install a Malaysia eSIM.
Data roaming on a Malaysia eSIM: when you need it
The eSIM runs on a Malaysian network, and the store says switch data roaming on for the eSIM line only when it does not connect. Where the switch is.
Malaysia eSIM not connecting: the checks, in order
Is your eSIM not working in Malaysia? Check the line, mobile data and airplane mode, then data roaming, pick the network by hand, and write to support.
Malaysia eSIM refunds: when you get your money back
A full refund if the eSIM does not work and we cannot fix it. A working eSIM is not refunded. How to ask, and where the money goes.
Will your phone take an eSIM? Check before buying
Dial *#06#: if your phone shows an EID, it has an eSIM. It must also be unlocked. Check your model before you buy a Malaysia eSIM.
Still stuck?
Orders, QR codes and refunds are handled by VietSIM support. Write with the link to your order page and your phone model.
contact@vietsim.com