Indonesia eSIM & SIM card: stay connected from Bali to the remote islands

Bali at first light, a boat to the Gilis, a temple sitting on its rock at high tide, an impossible cliff above a beach on Nusa Penida, then east towards Komodo and its dragons. Indonesia is never a single place: it is an archipelago you cross, island to island, volcano to rice terrace. And the question lands the moment you pack: SIM card, eSIM, or will your plan do?

Here is the blunt truth most guides bury. Indonesia is not in Europe, so your UK plan does not roam for free here, and raw roaming can turn your bill into a horror story. A travel eSIM or a local SIM is almost always the sane choice. We have dug into this properly: the real plans, the genuine prices in July 2026, the much-feared IMEI registration (which barely touches a tourist), and above all the coverage island by island, the thing the “best eSIM” round-ups completely skip.

On the menu: your UK plan under the microscope (and why it stings outside Europe), the Telkomsel / Indosat / XL / Smartfren line-up, what an Indonesian SIM really costs, the Holafly eSIM, network coverage from Bali to the remote islands, and our signature section: staying connected while island-hopping, from the Gilis to Raja Ampat.

Why you need mobile data in Indonesia

Indonesia is a country where your phone works from morning to night. For getting around first: Google Maps to navigate the maze of Canggu or Ubud, the ferry and speedboat booking apps (between Bali, the Gilis, Nusa Penida and Lombok, everything is booked online), Gojek and Grab to summon a scooter-taxi or a meal in two taps (genuinely life-changing on the ground), and translation to decode a warung menu.

Then there is everyday Indonesia: booking a surf lesson or a Komodo dive trip, paying for a last-minute excursion, checking the weather before a sunrise hike up Bromo, scanning a QR menu, sending your rice-terrace photos before envy sets in back home. Gojek and Grab in particular have become essential: without data you cut yourself off from the cheapest, simplest way to get around and eat across the whole country.

Three ways to stay connected: your UK plan roaming (expensive here, since Indonesia is outside Europe), a local Indonesian SIM (Telkomsel, Indosat, XL or Smartfren) bought on arrival, or a Holafly Indonesia eSIM activated from home before you leave. We go through each, and we save the decisive point for last: coverage when you are on the move.

Solution 1: will your UK plan work in Indonesia (and at what price)?

Start with the most profitable advice in this whole guide: before buying anything, check what you already have. The catch is that for Indonesia, the answer is rarely good news.

Indonesia sits well outside the EU and outside every UK network’s “Europe” roaming zone. So free roaming, the thing you enjoy in Spain or Greece, simply does not apply. Instead you land in one of the priciest zones each network has. On O2, the Rest of World setup runs at roughly £6 a day. Vodafone drops Indonesia into its top zone at around £6 to £8 a day. EE applies a steep daily pass or per-MB billing.

And Three is the real trap. Its newer Value plans scrapped worldwide roaming altogether, keeping only European destinations, so Indonesia is not included at all, and you are exposed to brutal per-MB charges unless you are on a pricier Complete plan. The honest first step here is not “buy an eSIM” before checking, it is “open your network’s app, find the roaming terms for Indonesia, and look at the daily rate”. The table just below spells it out network by network.

So your UK plan is the first thing to check, but in Indonesia it is rarely the answer. If you want unlimited data without a runaway bill, or you are heading for the small islands where coverage gets tricky, read on for the local and eSIM options.

Telkomsel, Indosat, XL, Smartfren: the Indonesian operator line-up

The Indonesian market is built around a handful of national operators, and choosing between them is not just about price: in an archipelago, it is first and foremost about coverage.

Telkomsel is the state-owned operator, the undisputed leader, and our hero operator for one simple reason: it has the best coverage in the country, by a distance in remote areas. The moment you leave Bali and Java (Komodo, Flores, Raja Ampat, Sulawesi, deep jungle), it is often the only network still standing. Pricier than the rest, but if your itinerary flirts with the outer islands, it is the one to have. Its “Tourist Prepaid Card” is clear and built for travellers.

XL Axiata, the main rival, is hugely popular in Bali and Lombok, with coverage often comparable to Telkomsel in tourist areas at a slightly lower price. Perfect for a Bali-plus-Lombok trip, a notch below once you push towards isolated islands.

Indosat (with its IM3 brand, born from the Tri merger) plays the value game: aggressive pricing, big data buckets, ideal in cities and on the Java-Bali-Lombok axis. Smartfren, the smaller player, has one trump card: it is the only one offering a tourist eSIM you can buy and activate 100% online before you leave, handy for landing already connected without queuing.

Before comparing a local SIM against your plan or an eSIM, two tools to see clearly what each option really gives you.

Pros and cons of SIM cards for Indonesia

How much does a SIM card cost in Indonesia in July 2026?

Now the concrete bit. Mobile data in Indonesia is among the cheapest in the world, as long as you buy in the right place and know a rule or two.

At Telkomsel, the leader, expect around 150,000 rupiah (about £7.50) for 25GB in an official store (a GraPARI, or an authorised reseller in town). Indosat undercuts everyone with its IM3 brand: around 30GB for 100,000 rupiah (£5), often the best value. XL Axiata offers its Xtra Combo packs (12 to 22GB) between 73,000 and 195,000 rupiah, with a comfortable validity. Smartfren leans on its unlimited tourist eSIM (1.5GB/day fair-use) activatable online before departure.

Where to buy? In operator stores (Telkomsel GraPARI, XL Centers) you get the official price and the passport registration done properly. Avoid Denpasar airport for price: the same SIM sells for two to three times more there (a Telkomsel card at 150,000 rupiah in town can hit 350,000 at the airport). Handy for stepping off the plane connected, but you pay for the convenience. And in convenience stores like Indomaret, staff often cannot complete a foreign passport registration.

Here is an up-to-date, priced overview of the SIM cards and eSIMs available for Indonesia, with current plans and rates:

Buy your SIM on arrival or in advance from the UK?

Three ways to sort your data for Indonesia, each with its own logic. Our no-nonsense comparison.

Holafly Indonesia: our honest recommendation

Let us be straight. First step, again: check your UK plan, just so you know what raw roaming would cost. Spoiler: outside Europe, in Indonesia, it is rarely worth it.

If you want unlimited data without watching a meter, and you want to dodge both the shop hunt and the IMEI paperwork, our pick is the Holafly eSIM. Not because it is the cheapest per gigabyte (a local Telkomsel or Indosat SIM wins that round), but because it is the most relaxed: nothing to buy on the ground, your UK number kept live, and zero formalities.

With Holafly:

• you buy from your sofa in the UK before leaving
• you activate just before boarding, in two taps
• you arrive in Indonesia already connected, with no shop to find
• no top-ups to manage, no pack system to decode, no IMEI story
• you keep your UK number live alongside so you stay reachable
• the unlimited data runs on the Telkomsel and XL networks

In the interest of honesty: Holafly’s unlimited is comfortable but can be throttled beyond heavy daily use, and hotspot sharing is limited (around 0.5 to 1GB a day depending on the terms). Another transparency point: in genuinely remote spots (boats to Komodo, the depths of Raja Ampat), the underlying Indonesian network decides, and there a local Telkomsel SIM keeps a slight edge. For Bali, the Gilis, Nusa Penida, Lombok and the vast majority of trips, the Holafly eSIM works without a hitch.

Tap just below to activate your discount and land straight on the available Indonesia eSIM plans.

Network coverage in Indonesia: from Bali to the remote islands

Indonesia has a surprisingly good mobile network in cities and tourist areas, with strong 4G and a fast-growing 5G in Bali. But the country’s geography, 17,000 islands spread across three time zones, creates nuances worth knowing before you go.

Staying connected while island-hopping (from the Gilis to Raja Ampat)

Here we are, and this is the section that sets this guide apart. Because everyone will tell you “grab an eSIM, it is unlimited”, and everyone will stop there. But Indonesia is not a city where you drop your bags: it is an archipelago that keeps moving, island to island, and that is where connectivity is really decided. The “best eSIM” guides and the “island-hopping” guides live in two separate worlds that never speak. We bring them together here.

Which island actually gets signal. In Bali, Java, Lombok and on Gili Trawangan you are fine: 4G in the towns, all operators, your eSIM or local SIM will do. It is as you move further out that it gets tricky. The Nusa Penida viewpoints (the famous Kelingking cliff) are dead zones. Gili Air and especially Gili Meno are weak. And further east, towards Komodo, Flores and Raja Ampat, coverage becomes the number one factor. There, one network alone truly holds the line: Telkomsel. If your itinerary pushes to the outer islands, choose your option with that in mind (a local Telkomsel SIM, or at least an eSIM that routes a Telkomsel signal).

The black hole of the crossings. Here is the thing nobody tells you. Between two islands, on a ferry or a speedboat, you lose signal for much of the trip, it returns as you near the coast. On a Bali-to-Gilis transfer, or a multi-hour boat trip to Komodo, that is real stretches with no connection. The habit to build, and it is worth gold: download your tickets, your offline maps and your accommodation address BEFORE you board. No eSIM, no SIM, no plan catches a network that does not exist in the middle of the Flores Sea. The crossing is for watching the dolphins, not answering emails.

And if you push all the way to Raja Ampat. A bonus for the adventurous, because Indonesia does not end at Bali. The far east (Raja Ampat, Flores, Komodo) is one of the most beautiful corners on the planet, and one of the least covered: signal clings to the few towns (Waisai, Labuan Bajo), nothing once you dive or sail. Even Telkomsel shows its limits there. At that point it is no longer about choosing a plan, but accepting being offline, and frankly, that is part of the trip. Warn your family, download everything, and enjoy.

The bottom line: in Indonesia the price of data is a detail (it is one of the cheapest countries in the world), it is coverage on the move that counts. Bali and cities, any option works. Small islands, boats and the far east, go Telkomsel and download everything in advance.

Go further: our other SIM card guides by destination

If Indonesia is part of a bigger Southeast Asia loop, or you are already planning your next destination, we have written detailed guides with the same method and the same rigour on prices and coverage.

Conclusion: our honest advice

If we had to sum it up in one line: in Indonesia your UK plan will not save you (you are outside Europe, so roaming stings), which leaves two sane options. For a holiday, the Holafly eSIM with the code LAPLANETEDECARO for -5% off is the easiest: unlimited, activatable from the UK, your number kept, and zero IMEI paperwork.

A local Indonesian SIM is worth it for a long stay, a local number, or if you specifically want the remote islands covered: in that case it is Telkomsel and nobody else, the king of outer-island coverage. And whatever you choose, the real reflex in Indonesia is not the price per gigabyte (data is dirt cheap), it is anticipating coverage on the move: offline maps and bookings downloaded before every crossing, because in the middle of the Flores Sea, no plan on earth will save you.

The one mistake to avoid is choosing your option on price alone without thinking about WHERE you will actually get signal, and letting the IMEI story scare you when, as a tourist, it does not apply. Know where your itinerary takes you (laid-back Bali or the wild far east), and the right choice becomes obvious.

If we have missed a question, drop it in the comments and we will answer. And if you come back from Indonesia with a great connectivity tip (or a memory of three hours offline on a boat to Komodo), share it.

Safe travels in Indonesia (and save a little battery for sunrise over Bromo, that one, we promise, no story will ever do it justice).

PS: the small rule we apply for Indonesia as anywhere else: outside Europe, assume your UK plan will charge you and plan accordingly, install your eSIM before the flight, and download boat tickets and offline maps before every crossing. Three reflexes, and you never curse the middle of the Flores Sea.