Practical tips · June 23, 2026
SIM cards, eSIMs & internet in Chiang Mai
By The Ada House team
One of the quiet reasons Chiang Mai works so well for digital nomads is how absurdly easy and cheap it is to get online. Thai mobile data is fast, reliable and costs a fraction of what you'd pay back home. Here's how to sort your connection — from the moment you land to settling in for months.
The three networks
Thailand has three big operators — AIS, TrueMove H and dtac — all with nationwide 4G and growing 5G. For day-to-day use in the city (maps, calls, streaming, video meetings), any of them is fine. The one tip worth knowing: in the north, AIS generally has the widest coverage and fastest speeds, which matters if you'll head into the mountains or smaller towns. For a city-based stay, pick whichever is convenient.
Tourist SIM vs local SIM
Two broad choices:
- Tourist SIMs — sold to visitors in 8 / 15 / 30-day packages, loaded with lots of data (often 30–100 GB or "unlimited" with fair use). Roughly 299–1,199 THB depending on length. Easy, instant, set up for you at the airport.
- Local prepaid SIMs — the same networks, not branded "tourist." You buy a cheap starter SIM and add monthly data bundles. For stays of a month or more, these are better value per GB.
The smart move for many: a tourist SIM or eSIM to start, then switch to a local monthly plan once you've settled.
eSIM: land already connected
If your phone is recent (most newer iPhones, Pixels and Galaxies), an eSIM lets you arrive online — no shop hunting after a long flight. Install a plan by QR code before you fly (global providers like Airalo, or the Thai operators' own eSIMs).
The big perk: you can run the eSIM alongside your home SIM, keeping your home number live for banking codes while using cheap Thai data. The catches: some third-party eSIMs are data-only (no Thai phone number), and they can cost a little more than a local physical SIM at high data volumes.
Where to buy & the passport rule
- Airport counters — most convenient; staff activate and test it before you leave. Slightly pricier, but the markup is small.
- Operator shops in malls (Maya, Central Festival) — best for a specific cheaper local plan; staff speak enough English.
- 7-Eleven — starter SIMs and top-ups on nearly every street.
One legal must-know: all Thai SIMs require ID registration, so bring your passport — the vendor scans it to activate the SIM. Topping up later is quick: the operator app, any 7-Eleven, or a top-up machine.
Home wifi, cafés & coworking
For longer stays, mobile data is only half the picture:
- Home fibre — many condos and long-stay rentals include broadband, often 50–100 Mbps; fibre is cheap by Western standards. Our house keeps guests well covered.
- Cafés & coworking — Chiang Mai's café scene is famously laptop-friendly, and coworking spaces advertise 50–100 Mbps. Most cafés have free wifi (fine for light work). Start with our coffee guide around Nimman.
- Backup — even with great wifi, keep mobile data on hand for calls and time-sensitive work; many people just hotspot from their phone.
Our simple recommendation
- Check your phone is unlocked before you travel, or no Thai SIM/eSIM will work.
- Arrive connected with an eSIM, or grab a tourist SIM at the airport.
- Going long? Switch to a local monthly plan once you're settled.
- Match data to your work — heavy video-callers should just buy a big or "unlimited" plan; it's cheap enough not to think about.
Prices and bundles change often, so treat the numbers here as ballparks and check current deals in-store. Beyond that, getting online here is genuinely a non-event — and with the connection sorted, the rest of nomad life in Chiang Mai falls into place. Any trouble? Just ask us at the house.
Frequently asked questions
Which mobile network should I choose in Chiang Mai?
Thailand has three big operators — AIS, TrueMove H and dtac — and for everyday city use like maps, calls, streaming and video meetings, any of them is fine. The one tip worth knowing is that up in the north AIS generally has the widest coverage and fastest speeds, which matters if you'll head into the mountains or smaller towns. For a city-based stay, simply pick whichever is most convenient.
Where's the easiest place to buy a SIM?
Airport counters are the most convenient, as staff activate and test the SIM before you leave for a small markup. Operator shops in malls like Maya and Central Festival are best if you want a specific cheaper local plan, and the staff speak enough English. You'll also find starter SIMs and top-ups in 7-Eleven on nearly every street.
Do I really need my passport to get a SIM?
Yes — all Thai SIMs require ID registration by law, so do bring your passport, as the vendor scans it to activate the SIM. Topping up afterwards is quick, whether through the operator app, any 7-Eleven, or a top-up machine.
Should I go for an eSIM or a physical SIM?
If your phone is recent, an eSIM lets you land already online — no shop hunting after a long flight — and you simply install a plan by QR code before you fly. A lovely perk is running the eSIM alongside your home SIM, keeping your home number live for banking codes while using cheap Thai data. Do note that some third-party eSIMs are data-only with no Thai phone number, and can cost a little more than a local physical SIM at high data volumes.
How much does a tourist SIM cost, and is it good value?
Tourist SIMs come in 8, 15 and 30-day packages loaded with lots of data — often 30 to 100 GB or 'unlimited' with fair use — and run roughly 299 to 1,199 THB depending on length. They're easy and instant, ideal to get you started. For stays of a month or more, switching to a local monthly plan works out better value per GB, so many people start with a tourist SIM and then change once settled.
What about wifi for longer stays?
For longer stays, mobile data is only half the picture. Many condos and long-stay rentals include home fibre, often 50 to 100 Mbps, and it's cheap by Western standards — our house keeps guests well covered. Chiang Mai's café and coworking scene is famously laptop-friendly too, though it's always wise to keep mobile data on hand as a backup for calls and time-sensitive work.
