Chiang Mai eSIM — plans from ₹299.00

Chiang Mai International (CNX) is unusually close to town — the old city moat is barely ten minutes away — which tempts people into thinking connectivity can wait. It cannot, because the airport's onward options are all app- or negotiation-led: a metered taxi from the rank, a Grab or Bolt pickup from the designated bay, or a red songthaew where the price is agreed at the window. All of those go better with a live map on screen.

Operator counters in arrivals sell tourist SIMs with the usual passport registration, but the desks are few and a late-evening bank of flights backs them up quickly. An eSIM installed on home Wi-Fi avoids that: it stays inactive until the handset first finds a Thai network after landing, and only then does the validity clock start. Travellers arriving instead on the overnight sleeper from Bangkok reach the station on the far bank of the Ping and face the same first-mile problem. See Thailand plans.

AIS, True and NT all serve Chiang Mai strongly, with 5G across the old city, Nimmanhaemin, the Ping riverside and the Hang Dong and San Kamphaeng suburbs. Because the city is compact and low-rise there are few dead corners inside the moat. The interesting part is the terrain around it: the climb to Doi Suthep holds a decent signal thanks to the city below, whereas Doi Inthanon's summit road, the Samoeng loop and the mountain switchbacks north towards Pai and Mae Hong Son have real stretches with nothing at all. Chiang Rai and the Golden Triangle are covered in the towns, thinner between them.

Download Chiang Mai province offline, and add the Mae Hong Son loop if you plan to ride it, since that road has the longest gaps in northern Thailand. Data matters here for ride-hailing, temple and trek bookings, translation in the markets and Sunday Walking Street, and for cooking-class or homestay contact over LINE. Café Wi-Fi in Nimman is genuinely good, which is why the city attracts remote workers, but it collapses in the evening rush; tethering a laptop from the eSIM is the reliable backup. Cool-season mornings and hot-season afternoons both hurt battery life on long temple days, so carry a power bank. Contrast with the coast at Phuket.