What is an eSIM?
An eSIM — embedded SIM — is a SIM built into the phone rather than a chip you push into a tray. You download the plan, usually with a QR code, and the phone treats it exactly like a physical line. Here's what actually matters for a trip to Bali.
How an eSIM works
Any eSIM-capable phone carries a small built-in chip able to hold more than one plan at once. Buy a plan here and the activation code just appears in your order, no separate step. The phone writes it onto the chip, and from there it behaves exactly like a physical SIM.
The eSIM sits alongside your physical SIM rather than replacing it, so the phone runs both together: your own number stays reachable while the eSIM handles data on an Indonesian network.
eSIM or a SIM card bought on arrival
A local SIM in Indonesia means finding the counter, handing over your passport for the mandatory registration, and swapping a chip small enough to lose in a beach bag. An eSIM arrives instantly, installs in about two minutes, and cannot be misplaced.
The trade-off is worth stating plainly: a local SIM gives you an Indonesian phone number, which an eSIM data plan does not. If all you need is internet, the eSIM wins on time; if you are settling in for months and want a local number for local apps, buy the local SIM.
Which phones support eSIM?
iPhone XS onward, Galaxy S20 onward, Pixel 3 onward, and most flagship and mid-range Android phones from the last few years. A handful of regional variants ship without the eSIM chip even on a supported model line, so it's worth a quick check before you buy.
Why it suits a trip like this
The first day of a Bali trip is the jet-lagged one, and it is a poor day to spend in a queue. An eSIM removes the two slow steps: no roaming statement waiting for you at home, and no counter in arrivals when you would rather be in the taxi watching the rice fields go by.
You install the plan before leaving, and when the wheels touch down at Denpasar the phone finds a network on its own. Your messaging apps, your banking app and your number carry on as usual — on Lombok and the Gilis too, since the plan covers all of Indonesia.
Is an eSIM secure?
No less secure than a physical SIM — arguably more so. The plan lives inside a dedicated secure chip rather than a card someone could slide out of a lost phone, and both installing and removing it need the unlocked handset in hand.