Data roaming on a Singapore 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 Singapore 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 Singapore network, one of Singtel, StarHub, M1 or SIMBA. A line that connects and passes data needs no switches touched. A line that will not connect is the only case for data roaming on the eSIM line, then a retry: the store marks that switch as the fix when a line will not start.
Where the switches are
iPhone route: Settings, Cellular, choose the eSIM line, Data Roaming. Android: under the SIM settings, the eSIM holds the Roaming switch. The home line gets the same look, with the switch left off.
If it fails (Data roaming)
Signal showing but data stuck? Make the eSIM line the mobile data line again and confirm data roaming is on for it. Then follow not connecting.
More help
Install your Singapore 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 Singapore eSIM.
Switch your Singapore eSIM on when you land
After landing in Singapore, switch the eSIM line on and choose it for mobile data. If data does not start, turn on data roaming for that line only.
Singapore eSIM not connecting: the checks, in order
Is your eSIM not working in Singapore? Check the line, mobile data and airplane mode, then data roaming, pick the network by hand, and write to support.
Singapore eSIM refunds: when you get your money back
A full refund where the eSIM does not work and no fix is possible. A working eSIM is not refunded. How to ask, and where the money goes.
Does your phone support eSIM? Check before you buy
Dial *#06#: if your phone shows an EID, it has an eSIM. It must also be unlocked. Check your model before you buy a Singapore 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