Switch your Singapore eSIM on when you land
- Line on
- Mobile data on the eSIM
- Roaming only if needed
The short answer
In Singapore, bring the eSIM line online and hand it the mobile data role. Should data refuse to start, give the eSIM line data roaming and retry. The home line keeps data roaming off, so no charges can build up.
Checked October 2, 2026
On the eSIM line
Bring the eSIM line up and make it the one that carries mobile data (iPhone calls this Cellular Data). When data will not start, flip data roaming on for the eSIM line and make another attempt. Switch off the option that moves mobile data between lines; the home line then cannot take the data role back.
On your home line
The usual SIM needs data roaming switched off. Calls and texts to your number still arrive if the line stays on, and your home carrier bills them as before.
Give it a minute
Give the phone a couple of minutes to pick up the network. The signal bars and the network’s name appear next to the eSIM line: one of Singapore’s networks, Singtel, StarHub, M1 or SIMBA.
If it fails (Switch it on after landing)
Follow not connecting, one check after the next. The 30 days after buying are the install window; a trip that starts beyond them needs a note to the store’s support before you install.
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.
Data roaming on a Singapore eSIM: when you need it
The eSIM runs on a Singapore network, and the store says switch data roaming on for the eSIM line only when it does not connect. Where the switch is.
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