Best eSIM for Northern Thailand: Pai, Mae Hong Son & the Mountain Roads
On the Mae Hong Son Loop, the challenge isn’t buying enough data. It’s knowing which network you’re using—and what to do when the signal disappears around the next bend.
On a mountain road in northern Thailand, losing your mobile signal isn’t necessarily a sign that something is wrong with your phone. Sometimes you’ve simply rounded a bend and put an entire ridge between yourself and the nearest tower.
I’ve traveled through Pai, Mae Hong Son, Mae Sariang and Chiang Dao, and those journeys taught me not to judge a mobile network by how it behaves over breakfast in town. It’s the road afterwards that reveals its limits. I still want a phone I can use for directions, guesthouse messages and the occasional change of plans, but I no longer expect any eSIM to work through every valley.
What I’d buy: a Thailand eSIM whose specific plan lists AIS among its local networks, with enough validity for the whole journey. I’d install it before leaving Chiang Mai, download my maps, and assume there will be periods without service. My eSIM options are farther down the page.
Some links to eSIM providers are affiliate links, which may earn me a commission at no additional cost to you. The road advice comes from my travels; provider information and network details were checked separately. I haven’t run simultaneous speed tests of every network along every stretch of the loop.
Where I plan for signal gaps on the Mae Hong Son Loop
You can spend all morning in Pai with good mobile data, then lose it somewhere on the road to Pang Mapha. Later, in Mae Hong Son, everything may work again. That’s the rhythm to expect: connected towns, less predictable stretches in between.
The classic loop starts and ends in Chiang Mai, commonly following Highway 1095 through Pai to Mae Hong Son, then Highway 108 south through Mae Sariang and back toward Chiang Mai. Chiang Dao is not on that standard loop; it’s a worthwhile northern detour in its own right.
Chiang Mai to Pai
Highway 1095 · mountain bends, villages and viewpointsLeaving Chiang Mai with everything charged and downloaded is easy to overlook when your phone has full bars. I wouldn’t. The road winds into the mountains, and a working connection at a coffee stop doesn’t tell you whether it will last around the next bend.
Before setting out I save my Pai accommodation and the whole route, including the road back to Chiang Mai. It’s a simple precaution that takes less time than trying to find an address after data disappears.
Pai to Soppong / Pang Mapha
Highway 1095 · deep valleys and short, changing pockets of signalThis is the stretch where I least want to rely on live navigation. You can move from open hillside into a valley surprisingly quickly. If you’re staying outside Soppong or visiting Tham Lod Cave, save the turn-off and your return route before you leave Pai.
I would also check the guesthouse’s actual location rather than assuming that coverage in the nearest town extends to a cabin beyond it.
Pang Mapha to Mae Hong Son
Highway 1095 · winding approaches to the provincial capitalMae Hong Son is a welcome place to pause, find a café and organize the next leg. But I wouldn’t use a good connection in town as proof that the surrounding mountain roads will be the same.
This is also where I’d check the weather and get any guesthouse directions I still need. Mist and rain can complicate a mountain-road day much more than a slow eSIM.
Mae Hong Son to Mae Sariang
Highway 108 · quieter country, longer drives between overnight stopsThe riding feels different south of Mae Hong Son: fewer busy tourist stops, more quiet countryside and plenty of places where I’d expect patchy service. I keep the route saved and arrange my overnight stop before setting off rather than searching for one while moving.
Mae Sariang itself is a useful base. If you’re continuing farther south toward Mae Sot, that’s a separate journey, not simply another short hop on the standard Chiang Mai loop.
Mae Sariang back to Chiang Mai
Highway 108 via the Hot area · the return legBeing on the last leg is no reason to stop preparing. I make sure I have the directions available offline and don’t count on finding mobile reception whenever I want to change the day’s plan.
People often ask me which eSIM never loses signal on this loop. I can’t recommend one on that basis. Even the network I’d choose first can have blind spots in steep terrain. What matters is getting good service in the settled areas and being ready for the stretches in between.
Pai, Ban Rak Thai and Chiang Dao deserve their own checks
It’s easy to focus on the main highway and forget that some of the most memorable nights in the north are spent a few kilometers off it. These are the places where I’d ask my accommodation a more precise question: does my phone network work at your property, not just in the nearest town?
Pai: don’t judge the outskirts by the walking street
In central Pai, getting online is generally straightforward. A hillside guesthouse, riverside cabin or rural road is another matter. If I’m staying outside town, I check recent guest reviews for Wi-Fi and ask the host about mobile reception; I don’t assume that a nearby café’s fast connection means my room will have one.
Ban Rak Thai and Pang Ung: save the detour first
These are tempting side trips from Mae Hong Son, but they’re exactly the kind of journey where it’s worth downloading the turn-by-turn route before leaving. You’ll be winding through forested hills, often heading for small accommodations rather than a big commercial street. AIS is the network I’d look for, but I would still expect possible gaps.
Chiang Dao is its own northern escape
Chiang Dao is north of Chiang Mai rather than on the usual Pai–Mae Hong Son–Mae Sariang circuit. It deserves a place in this guide because the same problem appears around its mountain guesthouses: a good connection in the town doesn’t guarantee reception closer to Doi Luang Chiang Dao or along quieter approach roads.
If I’m staying near the mountain, I’d confirm the property’s Wi-Fi and have directions stored offline before leaving Chiang Mai. For a few relaxed days that’s often more useful than buying the biggest data plan.
Why I’d start with AIS, but wouldn’t rely on it blindly
For a journey involving Pai, Mae Hong Son and rural stops, AIS is the network I’d check first. Its broader national coverage and reliability results make it a sensible starting point, even though no nationwide score can tell you what happens at a particular hairpin bend.
There’s a useful 2026 distinction here. True and dtac are now part of the same merged operator, with integrated network infrastructure. They still appear under different names in eSIM listings, but treating them as two completely independent nationwide networks is misleading. Some plans also provide access to more than one local partner. The exact package matters.
If you’d like to compare the networks more closely before choosing, my AIS versus True/dtac guide covers national measurements, network integration and coverage patterns. For the loop itself, I’d put that information to work in a much simpler way: choose an AIS-capable plan, then plan for the places where no network is dependable.
Reference coverage maps: AIS, dtac and TrueMove views from nPerf, retained from the original guide. They help illustrate broad differences, but the maps are not live reception readings and do not guarantee signal on a mountain road. Source: nPerf.
Five things to do before leaving Chiang Mai or Pai
If I had to choose between a slightly faster eSIM and a properly prepared phone, I’d prepare the phone first. Those few minutes can save a lot of frustration on a remote road.
- Download the whole driving area in Google Maps. Include the road you’re taking, potential stops and your overnight destination. Make sure the download finishes, and check that the offline driving route is available.
- Keep the important details somewhere that doesn’t need data. Hotel address, Thai place name, booking confirmation and the number of your host belong in saved notes or screenshots, not only in a web page.
- Install and test the eSIM before the mountain roads. Follow its activation instructions while you have reliable Wi-Fi. Check data roaming if required and make sure you know how to switch between your home SIM and the travel eSIM.
- Bring power, fuel and a sensible margin of time. Navigation, photographs and poor reception can drain a phone. A power bank helps; it doesn’t replace checking fuel and road conditions.
- Tell someone your route if you’re riding alone. If you break down in a signal-free valley, an eSIM won’t bring the towers closer. It’s worth knowing where the next settlement is and when someone should expect to hear from you.
GPS isn’t the same as mobile data. Your phone can usually determine its location using satellite signals without an internet connection. But live traffic, searches and some navigation features still need data, which is why downloading maps in advance matters.
Three Thailand eSIMs I recommend for the loop
For this journey, I keep the choice fairly simple. I want a plan that names its Thai network, can be installed before departure and won’t expire before I’m back in Chiang Mai. These are the three I’d compare first.
Ubigi Thailand
Ubigi’s Thailand plan information lists AIS and TrueMove among its local networks, which is useful transparency for this kind of trip. It supports data sharing too, although that matters less to me on a riding day than knowing which carrier I can connect to.
I’d compare the current data bundle and validity, then make sure the coverage arrangements shown at checkout match the plan I’m buying.
See Ubigi Thailand plans
Nomad Thailand
Nomad is easy to compare if you want a familiar travel eSIM and a fixed amount of data for the journey. What matters on this route isn’t the familiar brand name but the network listed for your exact package.
If the current Thailand plan includes AIS and has enough validity for your route, I’d put it on the shortlist. I wouldn’t assume every Nomad plan everywhere uses the same carrier.
Check Nomad Thailand plans
Airalo Thailand
Airalo sells different Thailand plans, including options that name AIS and True. That gives you flexibility, but it also means the Airalo logo alone tells you very little about the connection you’ll get on the road.
I’d open the specific package’s network details before paying. If it suits my route and validity dates, it’s a reasonable alternative—not an automatic winner just because the app is familiar.
Compare Airalo Thailand plans
If you’d rather buy directly from a Thai operator, AIS Tourist SIM/eSIM is worth checking, particularly if you need a local number. Expect identification requirements. Yesim Thailand is another option, especially for larger data needs, provided its current local-network and hotspot terms match your trip.
Check plans just before buying: partner networks, packages, prices and fair-use rules can change. For broader provider and price comparisons, see my Thailand eSIM guide. If Thailand is one part of a longer Asia trip, my Nomad APAC review looks at regional plans too.
Questions I get about northern Thailand mobile coverage
Will I have mobile signal for the entire Mae Hong Son Loop?
No. You can expect usable service in many towns and settled areas, but mountain valleys and bends can interrupt reception on any network. Download directions and accommodation details before setting off.
Which network would I choose for Pai and Mae Hong Son?
I’d begin with AIS for its broader national coverage performance, then check the specific eSIM plan. But there isn’t a carrier that can promise reception at every viewpoint or remote guesthouse.
Is Chiang Dao part of the Mae Hong Son Loop?
Not on the standard circuit. The usual loop travels from Chiang Mai via Pai and Mae Hong Son to Mae Sariang before returning to Chiang Mai. Chiang Dao is a separate northern detour, worth visiting if you have extra time.
Do I need unlimited mobile data on the loop?
Usually not for navigation, messages, bookings and occasional browsing. I’d rather have a sensibly sized plan on a suitable local network than unlimited data I can’t use in areas without reception. If you’re working remotely, see my Thailand eSIM guide for digital nomads for hotspot and video-call needs.
Does Google Maps work without phone signal?
Downloaded offline map areas can provide driving navigation using your phone’s GPS location, though live traffic and some features won’t work. Download and check the maps while connected.
The phone is useful, but the mountains are the point.
For Pai, Mae Hong Son and Mae Sariang, I’d start with an eSIM that explicitly includes AIS, keep a backup plan for no signal, and enjoy the drive without checking the bars on my phone every five minutes. The places I remember most from northern Thailand aren’t the ones where I had the fastest data connection.
If your next trip heads south rather than into the hills, my Thailand islands eSIM guide covers a very different kind of connectivity challenge: islands, beaches and ferries.
Last Updated on 16/10/2026 by Panos
