Data roaming on a Malaysia eSIM: when you need it
- Only if it will not start
- On for the eSIM line
- Off at home
The short answer
The eSIM runs on a Malaysian network, so data roaming is normally not needed: leave it off. If the eSIM line does not connect, turn data roaming on for the eSIM line and try again; that is the store's own guidance. Keep data roaming off on your home line.
Checked October 2, 2026
When to switch it on
The eSIM connects to a Malaysian network, one of Maxis, CelcomDigi or U Mobile. When the line comes up and data moves, no switch needs touching. If the line will not connect, switch data roaming on for it and try again: that is the toggle the store points to when a line does not start.
Where the switches are
On an iPhone: Settings, Cellular, tap the eSIM line, then Data Roaming. On Android the path is the SIM settings, then the eSIM, then Roaming. Repeat on your home line, where it goes off as well.
If it fails (Data roaming)
If the eSIM shows signal but no data, check that the eSIM line is chosen for mobile data and that data roaming is on for it. Then follow not connecting.
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.
Switch your Malaysia eSIM on when you land
After landing in Malaysia, switch the eSIM line on and choose it for mobile data. If data does not start, turn on data roaming for that line only.
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