Roaming or an eSIM in Singapore: what changes
Roaming keeps your home line working in Singapore at your carrier's rates. A prepaid eSIM gives you a separate data line that cannot add charges.
- Prepaid, no extra charges
- Data roaming only if needed
- Home line stays on
The short answer
Roaming on your home line charges your carrier's rates in Singapore. The eSIM from this site is prepaid: you pay once, it runs on a Singapore network, and it cannot add charges. Data roaming stays off on both lines; switch it on for the eSIM line only if the line does not connect.
Checked October 2, 2026
Home roaming against an eSIM
Cost
- Roaming on your home line
- Your carrier's roaming rates
- eSIM from this site
- Paid once, when you buy the plan
Extra charges
- Roaming on your home line
- Possible, depending on your carrier
- eSIM from this site
- None: the plan is prepaid
Setup
- Roaming on your home line
- Nothing to install
- eSIM from this site
- Set up at home; made live after landing
Data roaming switch
- Roaming on your home line
- Keep it off
- eSIM from this site
- Off, bar one case: the eSIM line when it will not connect
Your number
- Roaming on your home line
- Your own, at your carrier's rates
- eSIM from this site
- Your own stays on; the eSIM plans carry data only
Which switch goes where
For the eSIM line: power it on and give it the mobile data role. Off in principle; the eSIM line gets it only when it will not connect, exactly as the store guides. The home line keeps data roaming off, which rules out surprise charges, and stays on if calls and texts to your number are wanted. Your home carrier raises the bill for every call and text that reaches your home number.
The plan for this trip
30 days · 10 GB · US$11.88
Data only, tax included. Each plan names its Singapore network before you pay.
Buy on VietSIMQuestions
Do I need a shop for the eSIM?
No. The eSIM is bought online before you fly, and the QR code appears on screen right after payment; save the page link, because it is where your code is kept. A SIM card bought in Singapore is registered at the point of sale, and the shop asks for your passport.
What makes the eSIM line need data roaming switched on?
Only if the line does not connect. The plans run on Singapore networks, so the switch normally stays off; the store names it as the fix for a line that will not start, and a prepaid plan cannot add a charge because of it.
Sources
Where the facts on this page come from.
Get your Singapore eSIM before you fly.
Plans from US$4.88, tax included, on Simba, StarHub or Singtel, or the four-country regional network. Pick one here and pay on the store in US dollars.
See the plansCheckout on VietSIM · full refund if it does not work