Buy your Indonesian SIM before you need it, not after you are tired, hot, and standing outside a small airport hoping the one counter you vaguely imagined is definitely open. The easiest answer is still Telkomsel, and the easiest place to get set up is still a bigger airport or a more established shop before you start moving deeper into the trip.
Who This Is For
Anyone travelling to Labuan Bajo who wants reliable mobile data, sensible network advice, and the least annoying route to getting connected.
Which Network to Use
Telkomsel is still the safest recommendation for Labuan Bajo and wider Flores. In town, other networks may work perfectly well. Once you get further out, or start leaning on your phone more heavily than a casual traveller would, Telkomsel is usually the steadier bet.
No network is magic in remote eastern Indonesia. On the road, out at sea, or on park islands, signal can drop away entirely. That is not a provider failure so much as the basic geography of what you are doing.
Where to Buy
Bali or Jakarta airport: still the cleanest option for most people.
Labuan Bajo Airport: possible, but best treated as a bonus rather than the core plan.
Town shops in Labuan Bajo: workable if you missed the earlier opportunity.
The main advantage of buying earlier is not just choice. It is that your phone works immediately when the trip begins.
Registration
Foreign SIM registration in Indonesia requires your passport details. This is normal. Staff usually handle the process for you if you buy through an airport kiosk or a proper phone shop.
Plans and Cost
Package pricing changes often enough that fixed blog-post numbers age badly, but the broad shape remains the same: smaller short-trip packages are cheap, medium packages are still reasonable, and for a one- to two-week trip you do not need anything heroic unless you plan to work remotely or upload half your life in 4K.
What Coverage Is Actually Like
In town: usually fine.
Around the harbour: generally solid enough for normal travel use.
On inland roads: patchier.
On Komodo boat days and around the islands: expect dead zones and stop pretending you are shocked. Download what you need beforehand.
eSIMs
eSIMs are a good option if you do not want to swap physical SIMs. The only thing that matters is which local network they ride on. If you are choosing one for eastern Indonesia, the safest move is still to look for something backed by Telkomsel rather than picking based on branding alone.