Southeast Asia on One eSIM, Country by Country
Roami Team
Roami offers reliable eSIM plans, serving over 1 million travelers annually, and supports automatic local network switching to help travelers stay connected globally.
📑 Table of Contents
Southeast Asia is the region where a regional eSIM makes the most sense and disappoints the most people, and both halves of that sentence are true for the same reason: eleven destinations sit inside a product that is usually sold on the strength of four of them.
Bangkok, Singapore, Bali and Hanoi are on every plan and work beautifully. The other seven are where the questions live — whether Cambodia is on the list, whether the ferry to the Gilis has signal, whether an Indonesian SIM needs your phone registered, and why a plan that says Southeast Asia does not seem to include the island you booked.
This page is the country-by-country version of that. It is not a route guide: if your trip is a land crossing between Vietnam, Cambodia and Thailand, the three-country border guide is closer to your problem. If you have not yet decided whether to buy regional or local at all, the Asia coverage guide sets out the decision. Here the assumption is that you have picked a regional plan and want to know what it will and will not do across eleven countries. If what you wanted was an esim southeast asia buyers’ shortlist rather than a coverage audit, the eight-plan comparison does that job; this page is the map underneath it.
The shape of the answer. One regional plan is the right purchase for any Southeast Asian trip that touches three or more countries. It will cover the four obvious stops completely, cover the smaller entries on most but not all products, and lose signal in the places where nobody has signal — the open sea, the far side of an island, and the inside of a mountain. What differs between plans is almost entirely the list, which is why the list is what to check.
Eleven destinations, and how many are on a Southeast Asia plan
The region is conventionally eleven: Singapore, Malaysia, Thailand, Vietnam, Indonesia, the Philippines, Cambodia, Laos, Brunei, Myanmar and Timor-Leste. Products sold as Southeast Asia plans do not agree on that number, and the disagreement is the most useful thing to know before buying.
Three tiers exist in the market and the price difference between them is small enough that the list should decide the purchase.
The nine destinations tier. Singapore, Malaysia, Thailand, Vietnam, Indonesia, the Philippines, Cambodia, Laos, and usually Brunei. This is the mainstream product and covers every stop on a normal holiday.
The eight destination tier. The same list minus Brunei, or minus Laos. These exist because wholesale agreements in smaller markets are harder, and they are the ones that catch people who assume the region name means the region.
The Southeast Asia-plus tier. Adds Myanmar, Timor-Leste, and sometimes Bangladesh or Sri Lanka so the product can be sold as covering a wider map. The additions are rarely useful to a holidaymaker and never harmful.
The practical check takes two minutes and is worth doing before you pay: open the coverage list, and look specifically for Brunei, Laos, Timor-Leste and the Philippines. Those four are where products diverge, and they are exactly the four that a two-week itinerary is least likely to need and most likely to be missing when it does.
One caution about the word Southeast Asia on a product page. It does not mean the ASEAN ten plus Timor-Leste in any consistent way, and it does not imply that the plan covers the sea between the islands, which is a separate question addressed further down.
The six gaps a Southeast Asia plan leaves
Six specific places where a regional plan will let you down, listed because each has cost somebody an afternoon.
Timor-Leste. Almost never included. If Dili is on your itinerary you are buying a local SIM there, and the product is small enough that the airport counter is the reliable route.
Brunei. Frequently included and occasionally not. Two nights in Bandar Seri Begawan is the only reason to care, and if the plan excludes it the local prepaid product is cheap and easy.
Indonesia beyond Bali, Java and Lombok. The regional plan works where Telkomsel works, and Telkomsel covers an extraordinary amount of the archipelago. What it does not cover is the sea between the islands, and what thins out is everything east of Lombok — Flores, Sumba, Raja Ampat and the Moluccas have coverage in the towns and none in the places people go for.
The Philippines beyond the Manila–Cebu–Palawan path. Same shape. Metro Manila, Cebu, Bohol, Siargao and El Nido are fine. The smaller Visayan islands and the far north of Luzon are not, and the ferry between them is not.
Laos outside Vientiane and Luang Prabang. The two cities are covered. The road between them, the Bolaven Plateau and the far north are patchy in a way that matters if you are riding a motorbike rather than flying.
Every sea crossing. This is the real one. Ferry routes across the region — Bali to Lombok, Surabaya to Bawean, Cebu to Bohol, Krabi to Koh Lanta, Singapore to Batam — lose signal for between twenty minutes and two hours. A regional plan does not fix that, and no local SIM does either. It is geography.
Read that list as a map of where to download rather than a reason not to buy. On a two-week trip the gaps cost you an afternoon of connectivity at most; the alternative, seven local SIMs, costs you seven registration processes.
Singapore and Malaysia: the causeway is the easy border
Singapore and Malaysia pair up more naturally than any other two countries on this list, and they are usually someone’s first two stops, so they are worth treating together.
Singapore has three main networks — Singtel, StarHub and M1 — plus newer entrants, and coverage is essentially total, including inside the MRT tunnels and most buildings. The only friction is regulatory: prepaid lines must be registered against a passport, and there is a cap on how many prepaid lines one passport can hold, which matters if you are a family. A regional eSIM skips the registration entirely.
Data use in Singapore is low by regional standards because the Wi-Fi is excellent and free in most public spaces. Two days in Singapore is a 1 GB problem, and the Singapore plan comparison is the place to look if the stay is longer than that.
Malaysia runs on Maxis, CelcomDigi and U Mobile, with good urban coverage on the peninsula and thinner coverage in Sabah and Sarawak. Kuala Lumpur, Penang, Malacca and Johor Bahru are all fine. The interior of Borneo is not, and if your trip includes a Kinabatangan river lodge or a Mount Kinabalu climb, plan for the lodge’s Wi-Fi rather than your plan.
The causeway. The Singapore–Johor crossing at Woodlands or Tuas is one of the busiest land borders in the world and the phone behaves exactly as described in every border section of every guide: it loses signal in the queue, may reattach to the Singapore network on the Malaysian side because that signal is stronger, and picks up a Malaysian operator within a few minutes. On a regional plan that transition costs nothing. On a Singapore-only plan it costs a coverage gap.
One practical detail for the causeway specifically: the crossing can take ten minutes or two hours depending on the day, and the queue is a bad place to discover you have no offline map of Johor Bahru. Download it before you leave the hotel.
Thailand: islands, the north, and what the passport buys
Thailand is the region’s most mature tourist mobile market and the one where the local option is most tempting, so the comparison is worth doing properly.
The networks. AIS has the widest rural footprint, True has the strongest urban throughput, and the two merged their infrastructure in a way that has consolidated the market. For a visitor, the practical difference is small in Bangkok and Chiang Mai and meaningful on the islands and in the north.
What the passport buys. A Thai tourist SIM at Suvarnabhumi or Don Mueang requires a passport, takes about ten minutes, and costs roughly 300 to 600 baht for a week of data depending on the bundle. It is genuinely good value and the counter is efficient. What it does not buy is convenience: you queue after a long flight, and the queue at 1 a.m. is the queue.
The islands. Koh Samui, Koh Phangan and Koh Tao have good coverage in the populated parts. The Similan and Surin islands have none, because they are national parks with no permanent infrastructure. Koh Lipe has coverage in the walking street and thin coverage on Sunrise Beach. This is what the regional plan’s last mile looks like: fine where people live, absent where they visit.
The north. Chiang Mai and Chiang Rai are well covered. The Mae Hong Son loop, Pai’s outlying valleys and the border regions toward Myanmar are patchy. A rider doing that loop on a regional plan will have data in every town and none on the connecting roads, which is exactly when the map matters.
The far south. Narathiwat, Yala and Pattani carry travel advisories and thinner coverage. Most itineraries do not go there.
Thailand is also the country in this region where the regional plan is closest to being beaten on price, and the only place where the hotspot rule decides the purchase. A week in one place: buy locally. A week that touches three countries: the regional plan wins on admin and roughly ties on money.
Vietnam: one long country, three networks
Vietnam is 1,650 kilometres from north to south and the mobile experience changes along that length more than the plan does.
The networks. Viettel has the widest rural and mountainous coverage and is the one to be on if you are riding the northern loop. Vinaphone and Mobifone are strong in cities. Vietnamobile is a budget option with corresponding coverage.
Registration. Vietnamese prepaid requires passport-based registration, and verification has tightened in recent years with photo capture at the counter. Airport counters at Hanoi and Ho Chi Minh City are the reliable route and take about fifteen minutes. Street vendors sell SIMs registered to somebody else’s identity, which is both a legal problem and a practical one when the line is cut.
Where the plan matters. The northern loop — Ha Giang, Dong Van, Meo Vac — is the single best argument for a plan that can attach to more than one network, because Viettel is not always the best signal in a valley and being able to fall back matters. The reunification railway between Hanoi and Ho Chi Minh City has long stretches with nothing, and the coastal road has gaps between towns.
Where it does not. Hanoi, Ho Chi Minh City, Da Nang, Hoi An and Nha Trang are all well covered and unremarkable. Ha Long Bay has coverage in the harbour and less among the karsts.
Vietnam is one of the two countries in this region where a local SIM remains a genuinely good purchase for a long stay and a genuinely annoying one for a short trip. Two weeks moving north to south: regional plan. Three weeks based in Da Nang: local.
Indonesia: 17,000 islands and one IMEI database
Indonesia is where the regional plan earns its price most clearly, and the reason is not coverage.
The IMEI rule. Since April 2020, an Indonesian network will refuse a handset whose IMEI is not in the national database. A phone brought in from abroad gets access through a tourist registration handled by the operator when you buy a local SIM or eSIM — commonly up to 90 days, not extendable, and limited to two registrations per phone and passport in any twelve months. A handset on inbound roaming is exempt entirely.
So the choice in Indonesia is not between a cheap local SIM and an expensive regional plan. It is between a registration process and no registration process. A regional eSIM is outside the rule because it is roaming; an Indonesian eSIM or SIM is inside it because it is not. That single fact is worth more than the price difference on any trip shorter than three months.
The networks. Telkomsel has by far the widest footprint across the archipelago, which matters the moment you leave Java and Bali. Indosat and XL are strong in cities. Smartfren is a budget option.
Where it works. Bali, Lombok, the Gilis, Java including Yogyakarta and Surabaya, and the main towns of Sumatra and Sulawesi. Bali in particular has excellent coverage in Canggu, Seminyak, Ubud and Uluwatu.
Where the signal ends. The Bali–Lombok ferry loses signal for most of the crossing, and no quota on any plan changes that. The Gilis have coverage in the harbour and patchy coverage elsewhere. Flores, Sumba, Raja Ampat and the Moluccas have town coverage and nothing between towns.
The one thing to check on your plan. Whether the Indonesian data is carried as roaming or as a local Indonesian line. If a provider sells an “Indonesia eSIM” that is actually an Indonesian local product, the IMEI rule applies to it and you will need the registration. A regional Asia plan is normally roaming and therefore exempt, which is the version you want. The Indonesia provider comparison is where that distinction gets tested.
Philippines: 7,600 islands and the ferry problem
The Philippines is the hardest country in the region to stay connected in on a moving itinerary, and it has nothing to do with the plan you bought.
Registration. Every SIM must be registered under the SIM Registration Act, which means photo identification and a registration step. A regional eSIM skips it entirely.
The networks. Globe and Smart are the two that matter, and each has regions where it is materially better. Smart is generally stronger in Metro Manila and Luzon; Globe is strong in Cebu and parts of the Visayas. Neither is uniformly better, which is the argument for a plan that can attach to either.
Where it works. Metro Manila, Cebu City, Bohol, Siargao, El Nido, Coron and Boracay all have usable 4G, and 5G in the metro areas. Palawan’s underground river area is covered at the entrance and not on the trail.
Where the ferries win. Cebu to Bohol is about two hours with roughly an hour of nothing. Manila to Boracay involves a flight, a van and a boat, and the boat has no signal. The smaller Visayan islands have coverage in the port town and none on the beaches, which is where the accommodation is.
The planning consequence. In the Philippines, connectivity is a function of how you move rather than where you sleep. A trip that flies between three bases has three days of good data. A trip that ferries between six islands has three days of good data and three days of hoping. Download the ferry schedules and the accommodation addresses before each crossing, and treat the crossing as a planned offline period rather than a failure.
Cambodia and Laos: the two entries that vanish from narrow plans
Cambodia and Laos are the pair most often dropped from the eight-destination products, and both are worth checking for specifically because they are increasingly on real itineraries.
Cambodia runs on Smart, Cellcard and Metfone. Phnom Penh, Siem Reap and Sihanoukville are well covered, including 4G at Angkor, which is better than most visitors expect. The road between Siem Reap and the Thai border at Poipet is patchy, and the crossing itself is the busiest land border in the region for tourists.
Cambodia is also the country where the regional plan does the most visible work, because the alternative is a passport registration at a border-town shop where nobody speaks English and the queue is a plastic chair. If your route is Thailand into Cambodia by land, the Vietnam–Cambodia–Thailand crossing walkthrough covers the mechanics, and the short version is that a regional plan turns a 40-minute negotiation into a walk.
Laos runs on Unitel, Lao Telecom and Beeline. Vientiane and Luang Prabang are covered; the 2-day slow boat on the Mekong is not, and neither is most of the road between the two cities. The Bolaven Plateau in the south has coverage in Pakse and the coffee towns and nothing on the loop.
Laos is the country where a regional plan’s cost is easiest to justify: a local tourist SIM requires a passport and a visit to a shop, the shops are fewer, and a two-day stay does not justify either. A plan that includes Laos is worth a few dollars more than one that does not, and this is the single most common reason to pay for the wider tier.
Myanmar: the eleventh country almost no plan carries
Myanmar is the one entry on the eleven-country list where the connectivity question is not the first question.
Almost no regional plan carries it. A handful of wide Asia tiers list Myanmar; the mainstream nine-destination Southeast Asia bundles do not. If Yangon is on your itinerary, check the coverage list for the word Myanmar specifically rather than assuming a regional plan reaches it, because some products list it and some quietly do not.
The network picture is less stable than the coverage maps suggest. MPT, Telenor Myanmar and Ooredoo built usable 4G in Yangon, Mandalay and Naypyidaw, and on paper that infrastructure is still there. Since 2021 the operating environment has been through ownership changes at the Telenor operation, periodic restrictions and outages with no infrastructure cause behind them. A cell drawn on a coverage map and a cell you can rely on for a week are two different claims in Myanmar in a way they are not in Thailand.
The practical answer. A regional plan that includes Myanmar is worth having as a backup and is not a substitute for checking your own government’s current travel advice before you book. This page does not give that advice; it only notes that connectivity sits downstream of it. Travellers who do go generally find Yangon and Mandalay workable and everything outside them variable, so treat data there as a bonus rather than as part of the plan.
What a Southeast Asia plan costs against seven local SIMs
Seven countries is not an unusual trip length in this region, and the arithmetic on seven local purchases is worse than people expect.
| Approach | Cost for a 21-day, seven-country route | Effort | What you lose |
|---|---|---|---|
| One regional plan, 20 GB over 30 days | $38–48 | One install, one switch-on | Nothing material; the plan is a roaming profile so slightly slower in cities |
| Seven local SIMs | $45–70 plus transport to shops | Seven shop visits, seven passports, one IMEI registration in Indonesia | Two half-days of your trip |
| Four local SIMs and one regional plan | $45–60 | Middle | The complexity without the saving |
| Home operator’s roaming pass | $200+ for 21 days | None | The money |
The second row is the one that matters, because it is what the “buy local, it’s cheaper” advice actually costs once you count the visits. Seven SIMs at 150 to 300 baht or dong or rupiah each is not a fortune, but the seven trips to a shop are, and the Indonesian IMEI registration alone can consume an afternoon.
The fourth row is worth pricing rather than assuming. A US carrier’s Southeast Asia add-on at $10 to $12 a day is $210 to $252 for three weeks, which is five times a regional plan and buys nothing extra except the absence of a decision.
There is a middle case that deserves naming because it is underrated: base yourself in one country for two weeks and take one three-day trip across a border. In that case a local SIM for the base plus a small regional tier for the trip is cheaper than either extreme, and it is the only configuration in this table where you get both the local price and the border coverage.
Which of the eleven are worth a local SIM anyway
The buy-local-it’s-cheaper advice is right in about three of the eleven and wrong in the rest, and the split is not about price.
| Country | Local SIM verdict | Why |
|---|---|---|
| Thailand | Worth it for a single-base stay of a week or more | Counters are efficient, bundles are cheap, a passport is enough |
| Vietnam | Worth it for three weeks or a long stay in one city | Airport registration is quick and coverage in the far north is better on a local line |
| Indonesia | Rarely worth it | The IMEI registration costs more time than the money it saves on any trip under a month |
| Philippines | Rarely worth it | Registration Act paperwork, and Globe versus Smart is a per-island choice you cannot make in advance |
| Malaysia | Sometimes | Cheap and easy at KLIA, but a regional plan already covers the peninsula well |
| Singapore | No | Two days of data is a 1 GB problem and the public Wi-Fi is excellent |
| Cambodia | No | The counter experience is the reason regional plans exist in this region at all |
| Laos | No | Fewer shops than any other country here, and a two-day stay does not justify the visit |
| Brunei | No | Two nights, one small city, cheap prepaid if you decide you need it |
| Myanmar | Only if your itinerary and your government’s advice both support going | See above |
| Timor-Leste | Yes, unavoidably | Practically no regional plan carries it |
Read the no rows as a statement about time rather than money. A Cambodian local SIM is cheaper than the regional plan’s per-day cost and it costs you a border-town shop and forty minutes you will remember for years.
The Thailand and Vietnam rows are worth reading together, because they are the two where the local option actually wins and they win for opposite reasons. Thailand wins on logistics: a 300 to 600 baht bundle at an airport counter, ten minutes, no photo, no form in triplicate. Vietnam wins on coverage: a Viettel tourist line reaches valleys in Ha Giang that no roaming profile reaches, because the roaming profile is a guest on whichever network will host it and Viettel is not always the host. If your plan is Thailand plus two neighbours, buy locally in Thailand and let the regional plan cover the neighbours. If your plan is two weeks on a motorbike in the north, buy Viettel and ignore everything else on this page.
Island hopping costed: four islands, ten days
Island itineraries are the ones where people overbuy data, because the itinerary looks bigger than the connectivity requires.
Take a realistic ten days: two nights in Bali, two in Lombok, three in the Gilis, three back in Bali. Four ferry crossings or one flight, three sets of accommodation, and roughly thirty hours of the trip in places with weak or no signal.
| Cost item | Per person |
|---|---|
| Regional Asia plan, 10 GB over 15 days | $18–24 |
| Four Indonesian local SIMs, if you re-buy at each island | $30+ and four registrations |
| One Indonesian local SIM for the whole trip | $10–15 plus the IMEI registration |
| Hotel and café Wi-Fi | Free, and variable |
The third row is the honest local comparison, and it is genuinely cheap. What it does not account for is the registration, which on an Indonesian SIM means either the operator’s 90-day tourist registration or a customs visit, and the fact that the line cannot be replaced on a new handset if the phone is lost or dropped in the sea.
The data estimate for this trip is lower than most people guess: 10 GB is generous, 6 GB is realistic. The reason is not thrift, it is that the thirty hours on ferries and the evenings with no signal do not consume anything, and the days are spent in the water rather than on a screen.
What to download before each crossing: the ferry timetable, the next accommodation’s address and phone number, and an offline map of the arrival port. That list is worth more than an extra 10 GB.
If the plan you are looking at is sold as unlimited rather than metered, the number that matters is not the word on the page but the daily figure and the throttle behind it. The Asia unlimited data guide works through what those two numbers mean on a route that crosses borders.
The validity trap: 15-day plans on 18-day trips
The most common buying mistake in this region is not coverage and not data. It is the calendar.
A large share of Southeast Asia products are sold as 8, 15 or 30 days, and a large share of real itineraries run 17 to 22 days, because that is what a three-country trip becomes once flights and buffer nights are counted. Buy a 15-day plan for an 18-day trip and the profile stops working on day 16, in a country where you hold no local line and cannot buy one quickly.
Three ways out, in order of how well they work.
Buy the 30-day tier. It usually costs $6 to $12 more than the 15-day tier at the same allowance, which makes it the cheapest insurance on this page. On most providers the 30-day product is the same wholesale rate with a longer window, so the premium is smaller than the extra days suggest.
Buy two profiles and install both before you fly. Two 15-day profiles back to back cost slightly more than one 30-day and depend on you remembering to switch on day 16, which is exactly the kind of thing that gets forgotten on a beach.
Top up rather than re-buy. Where the provider supports it, a top-up extends the same profile. Check whether the top-up resets the validity clock or only adds data, because those are different products and the second one leaves you expired with a full allowance.
The check takes one line of arithmetic: compare your trip’s last day against the plan’s validity counted from activation, not from purchase. Activation is normally the first network attach in a covered country, which is why a plan bought three weeks early still works, and why you should not switch the profile on during a layover in a covered country when your trip has not really started.
Why “south east asia” and “southeast asia” return different plans
The two spellings are the same region and they return genuinely different product lists, which is worth knowing because it is a rare case where the search phrasing changes the answer.
Products named “Southeast Asia” tend to be the mainstream regional bundles from the large resellers: wide coverage, metered data, one profile.
Products that surface for “south east asia” skew toward the same bundles plus a long tail of country-specific products and older pages, because the spaced spelling is less contested. The result is that a search for the spaced version can return a Thailand plan, a Singapore plan and a regional bundle in the same list, with the regional one not obviously first.
If you searched for an esim for south east asia with the space in it and landed on a country product, that is the mechanism at work rather than a different market.
The practical instruction is to ignore the spelling and compare lists. Two products that both say Southeast Asia can differ by three destinations, and the only way to know is to open the coverage page and read it.
There is one more naming trap in this region. Some products are named for the ASEAN grouping rather than the geography, which excludes Timor-Leste by definition and sometimes includes entries people do not expect. A product named for a political bloc is not a product named for the map, and the coverage list is the only source of truth either way.
Wet season cuts coverage for an afternoon, not the plan
Nobody tells you this and it matters for roughly half the year.
Southeast Asia’s wet season runs at different times across the region — roughly May to October on the west coast of Thailand, November to February on the east coast and in Vietnam’s centre, and year-round in parts of Indonesia and the Philippines. During the wet season, two things change about connectivity, and neither is the plan.
Power interruptions take cells offline. Rural sites run on mains power with battery backup measured in hours. A multi-hour outage after a storm means a cell that is technically up and functionally congested. This is common in Indonesia’s outer islands, in the Philippines’ smaller islands and in rural Laos.
Rain attenuates the higher frequencies. The effect is real but modest at 4G frequencies and more noticeable at 5G millimetre-wave-adjacent bands, which in practice means the phone holds a signal and delivers less throughput.
The practical consequence is a planning one: in the wet season, treat the connection as something that can disappear for an afternoon rather than something that is either on or broken. Download in the morning. Keep the ferry ticket as a screenshot. Do not diagnose a plan failure during a storm.
Two weeks on a regional plan: what actually fails
A short list of the real failures, in the order they happen, from a trial of one regional profile across four countries.
The first attach takes longer than expected. Between 30 seconds and two minutes on first connection in a new country. Normal, and the moment people start reinstalling.
The phone attaches to the previous country. Most likely at a land border where the old signal is stronger. Fix: switch network selection to manual for the crossing.
A profile that installs and never attaches. Almost always a carrier lock on the handset, and the fix has to happen before you fly. Check the carrier lock line in settings at home.
The wrong line carries data. A dual-SIM phone with the default set to the home line shows signal from the regional profile and routes traffic through the home one. Four seconds to check, and the most common cause by a distance.
An allowance that runs out on the flight day. Not a failure, a planning error, and the one that hurts most because the airport is when you actually need the map.
Nothing at all on a ferry. Not a failure either. It is the sea.
The diagnostic order that saves time: check which line is the data line, toggle airplane mode for fifteen seconds, select the network manually, restart the phone, and only then reinstall. Reinstalling first is the step that wastes an hour, because it destroys the evidence.
Which Southeast Asia eSIM is actually the best buy?
Ask which is the best eSIM for Southeast Asia and every listicle gives a different answer, because they are all ranking on price. The best one is decided by your four worst hours, and the four worst hours on a Southeast Asian trip are the border queue, the ferry, the small island and the airport at 1 a.m.
Three countries or more: buy the widest coverage list at 10 to 20 GB. In this region that is the only decision that separates the mainstream products, because two plans at the same price differ by destinations and not by quality. A plan that includes Cambodia and Laos and costs $4 more is better than a cheaper one that drops them, and it is better by considerably more than $4 once you are standing at Poipet.
One country and a handful of islands: buy 10 GB and stop there. Island itineraries consume less than they look like they should, because the hours that would have burned data are the hours offshore. Paying for 20 GB on a ten-day island trip is paying for capacity you cannot reach.
Myanmar or Timor-Leste on the list: do not let a regional plan be your only plan. Neither is reliably covered and no amount of shopping fixes it. Cover the rest of the route with the regional plan and treat those two as local purchases or as planned offline days.
Landing at 1 a.m. into Bangkok or Manila: buy before you fly. The counters are open and the queue is the queue, and the install step is exactly what fails on airport Wi-Fi.
The comparison that separates the mainstream products is on the eight-plan scoring page, which ranks them on coverage, hotspot rules, throttle terms and China routing. What that page will not do is tell you which four countries to check on the list, and that is the part this page exists for: Brunei, Laos, Timor-Leste and the Philippines.
What travellers ask about the eleven-country list
What is the best eSIM for Southeast Asia? The one whose coverage list includes every stop you have booked, at 10 to 20 GB. Coverage decides it, not price: the mainstream products sit within a few dollars of each other and differ by three or four destinations, and the missing destinations are always the small ones. Check Brunei, Laos, Timor-Leste and the Philippines before paying, then take the widest list you can afford.
Is one Southeast Asia eSIM enough for a multi-country trip? Yes for any trip that touches three or more of the eleven, provided the coverage list includes each stop. Check Brunei, Laos, Timor-Leste and the Philippines specifically, because those are the four that products drop.
Which countries does a Southeast Asia eSIM not cover? Timor-Leste is almost never included. Brunei, Laos and Myanmar are the next most often missing. Everything else in the region is on the mainstream products.
Do I still need a local SIM in Indonesia? Only if your plan’s Indonesian data is a local Indonesian line rather than roaming. A local Indonesian SIM or eSIM requires the handset’s IMEI to be registered; a regional plan in roaming mode is exempt.
Does an eSIM for southeast asia work the same as one for Southeast Asia? The spellings describe the same region and return different product lists. Compare the coverage pages rather than the names.
How much data does a two-week Southeast Asia trip need? Six to ten gigabytes per person for ordinary use, and less on an island itinerary because the ferry hours consume nothing. Twenty gigabytes is for people tethering a laptop.
Is a regional plan slower than a local SIM? Slightly, because it is a roaming profile. In Bangkok, Singapore and Bali you will not notice. On rural routes a multi-network plan can be faster, because it is not pinned to one operator.
What happens on the ferry from Bali to Lombok? You lose signal for most of the crossing, on any plan and any network. Download the map and the address before you board.
Can I buy a Southeast Asia eSIM after I land? Yes, on airport Wi-Fi, at the same price. It is slower and no cheaper than buying at home, and the install is the step that fails on airport Wi-Fi.
Does the regional plan cover the sea between the islands? No, and neither does any other plan. Sea crossings are the one gap that money does not close.
The whole page reduces to one instruction: read the coverage list before you pay, and download before every crossing. Everything else about a Southeast Asia eSIM is either the same as any other region or already handled by the product.
