Getting a Thai SIM or eSIM as a foreigner — AIS, True and dtac plans compared, where to buy near Nimman, Maya Mall and the Old City, passport registration rules, top-up methods and the best options for digital nomads, DTV/LTR visa holders and coworking regulars.
Chiang Mai's digital-nomad reputation runs on decent mobile coverage, and sorting a local SIM or eSIM is one of the first things worth doing after landing at CNX. All three major networks — AIS, True and dtac (now merged with True) — require passport registration by Thai law, and all are sold at the airport, around Nimman and Maya Mall, and at 7-Eleven branches across the Old City. Below is what each carrier offers, where to buy, how registration and top-up work, and which plan suits a short stay versus a longer base near Nimman's coworking cluster. For home internet once you've settled into a condo or serviced apartment, see our Chiang Mai cost-of-living guide.
AIS has the strongest and most consistent network across Chiang Mai, including inside the Old City moat area, Nimman's coworking-dense sois, and the hillier fringes toward Doi Suthep and Mae Rim where some other networks weaken. It has the largest retail footprint in the city — AIS Shops at Maya Lifestyle Shopping Center, Central Festival and Central Chiang Mai Airport, plus counters at Chiang Mai International Airport (CNX) arrivals. Its tourist SIM2Fly and Traveller packages suit short stays; standard prepaid or postpaid plans suit anyone basing themselves in the city longer-term.
Best for: Digital nomads and residents who want the most reliable coverage across Nimman, the Old City and out toward Mae Rim/Hang Dong.
True runs a close second in Chiang Mai coverage and has a strong retail presence — True Shops at Maya, Central Festival and along Nimmanhaemin Road, close to the city's biggest cluster of coworking spaces and laptop cafes. True's fibre-plus-mobile bundles are popular with nomads who rent a condo or serviced apartment and want the same provider for home wifi and a mobile SIM.
Best for: Anyone also setting up True fibre at a Chiang Mai condo, or wanting a SIM from the same carrier serving Nimman's coworking hubs.
dtac remains a popular budget option in Chiang Mai, with a branch inside Central Festival and Kad Suan Kaew, and solid coverage through the Old City and Chang Phuak areas. Following the 2023 True-dtac merger the two networks are consolidating over time, but dtac SIMs and plans are still sold and supported separately for now, including its Happy Tourist SIM at CNX airport.
Best for: Budget-focused long-stayers who mainly need reliable data and don't need the absolute widest coverage.
All three Thai carriers offer eSIM activation you can set up before landing at CNX, useful for keeping a home SIM active in a second slot. Third-party eSIM apps (Airalo, Holafly and similar) also sell Thailand and regional data eSIMs that activate instantly on arrival, though they're usually data-only with no Thai phone number attached, and cost more per GB than a local carrier SIM bought in the city.
Best for: Travelers who want data working the moment they land at CNX, before sorting a local carrier SIM once settled near Nimman.
Thailand's National Broadcasting and Telecommunications Commission (NBTC) requires every SIM — prepaid or postpaid — to be registered against a valid ID. As a foreign visitor or resident, that means your passport: bring the physical document, since staff typically need to scan the photo page or chip and take a photo for the carrier's system. Unregistered or improperly registered SIMs can be suspended, so always register through an official channel (CNX airport kiosk, a carrier shop at Maya or Central Festival, or supported 7-Eleven staff) rather than accepting an already-activated SIM from an unofficial reseller.
Yes. NBTC rules require every prepaid and postpaid SIM in Thailand to be registered to a real ID — for foreigners that means your physical passport, since staff typically scan the photo page or chip and take a photo for the carrier's system.
AIS generally has the most consistent coverage across the Old City, Nimman and the hillier areas toward Doi Suthep and Mae Rim, plus the widest retail network for in-person support. True is a close second, especially strong around Nimman's coworking cluster, and worth considering if you're bundling True fibre at home. dtac (now merging with True) remains a reasonable budget pick for straightforward data needs.
Maya Lifestyle Shopping Center on Huay Kaew Road sits right at the edge of Nimman and has both AIS and True shops plus several independent phone stalls, so most digital nomads based around Nimman's coworking spaces sort their SIM there rather than trekking to the airport or Old City.
Tourist SIMs (AIS SIM2Fly, dtac Happy Tourist) are convenient at CNX airport and bundle a fixed data allowance for a set number of days, but cost more per GB and expire fast. Anyone staying more than a couple of weeks — which covers most DTV and LTR visa holders working from Nimman coworking spaces — comes out ahead switching to a standard prepaid or postpaid plan within the first week.
Yes. AIS, True and dtac all sell eSIMs you can activate before or after arrival, and third-party apps like Airalo or Holafly sell Thailand-specific data eSIMs that activate instantly. A carrier eSIM gives you a real Thai number, which matters if you need one for banking, delivery apps (Grab, LINE MAN) or visa paperwork; most third-party eSIMs are data-only.
Look for an unlimited or high-cap monthly data plan rather than a small tourist bundle — video calls and cloud syncing from a coworking desk add up fast. Most nomads pair a carrier SIM-only data plan (AIS or True, 30GB+ or unlimited-at-reduced-speed) with the coworking space's own wifi as backup, rather than relying on mobile data alone.
Coworking spaces · Laptop-friendly cafes & wifi · Cost of living · DTV visa · Chiang Mai city hub
Primary and official sources are cited above. Government rules, fees and procedures in Thailand change over time and vary by office; always confirm current requirements with the relevant authority before relying on them. BAANLYY never takes paid placement in editorial content.
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Hero photo by Silvie Lindemann on Pexels. General information, not legal or immigration advice. Carrier plans, prices and promotions change often — confirm current rates directly with AIS, True or dtac.