Timor-Leste is the eastern half of a mountainous island between Indonesia and Australia: one of the world's youngest countries, with some of its least-visited reefs. It is also absent from most roaming bundles, so install the eSIM before you fly and you are online when you step out into the heat at Dili.

Timor-Leste has no plan of its own: the plans below are regional and cover Timor-Leste along with its neighbours. The price is the region's.

Almost everyone arrives at Dili's small international airport, a few minutes' drive from the seafront, on one of a handful of flights from Darwin, Bali or Singapore. A few come overland from Indonesian West Timor through the border post near Batugade. There is no airport train and little signage: you will want a map, a message to your guesthouse and a fare agreed for the taxi.

Dili and the north-coast road that runs east to Baucau and west towards the border have usable 4G, and the district towns each have their own pool of signal.
The interior is another matter. Timor is a spine of steep mountains, and in the valleys around Maubisse, Hato Builico and Mount Ramelau the signal arrives on ridges and vanishes in between. The south coast and the far east are covered in the towns and not much elsewhere. Expect long silent stretches on any drive, and treat data outside Dili as a pleasant surprise rather than a plan.

Timor-Leste is a small market with a few local networks, and many home operators have either no roaming agreement here or a very expensive one. It is commonly missing from "worldwide" passes and from Asia and Pacific bundles alike — so a phone that worked in Bali yesterday may be silent, or ruinous, in Dili today. Check your price list before you switch roaming on.
Local SIMs are sold in Dili, with a queue, a passport and a registration form.
A travel eSIM takes the question away: a fixed price, paid before you leave, on a local network.
The currency is the US dollar, with local centavo coins for change. Cash machines are concentrated in Dili and do not always cooperate with foreign cards; outside the capital, assume there are none. Cards are taken at a few hotels and dive shops and almost nowhere else.
Carry small, clean notes — a large bill is hard to change in a village shop.
Electricity is dependable in Dili and less so in the districts, where cuts are common and some guesthouses run a generator for only part of the evening. Carry a power bank, charge whenever you can, and download offline maps before you leave the capital.
Roads are slow and rough: measure journeys in hours, not kilometres, and avoid driving after dark.
Often not, and rarely at a sensible price. Many operators have no roaming agreement here, and those that do usually put Timor-Leste in their most expensive zone, outside any daily or regional pass. Check your own price list — or use a travel eSIM and settle the cost before you leave.
Around Beloi and Vila on the eastern shore, usually yes, though it can be slow. On the west coast, in the hills and out on the dive boats, expect little or nothing. Let people know you will be hard to reach, and download anything you need in Dili.
Expect 4G in Dili and the larger towns, and slower or no data between them. Whether your plan uses 5G is shown on each plan's card.
No — a Timor-Leste plan covers Timor-Leste, and it stops at the border with West Timor. Indonesia has its own plans, and if your trip runs through Bali, Kupang or Darwin as well, a regional plan is the simpler choice.
You do not need one. Local SIMs are available in Dili, and buying one means showing your passport and registering it in a shop. An eSIM installed at home skips the errand and is working when you land.
Yes. The US dollar is the currency, and outside a few hotels, supermarkets and dive operators in Dili almost everything is paid in cash. Withdraw in the capital and take enough small notes for the whole of any trip into the districts or out to Atauro.
One eSIM can cover Timor-Leste and the countries around it — no need to buy a plan at every border:
Plans for the countries next door:
Where the signal is, how roaming treats the place, and what to know before you land.