Thailand's network environment
Thailand's main carriers are AIS, True and NT. 5G coverage is good in tourist cities — Bangkok, Chiang Mai, Phuket, Pattaya; islands like Koh Samui and Koh Tao, and the national parks, are mostly 4G.
A travel SIM runs on one of these networks, named on the plan card. For city itineraries the choice matters little; heading to islands or national parks, check which network your plan uses before you fly.
Buy before you fly, or on arrival?
Buying at the Bangkok airport counter is a habit for many — but there are queues, a language barrier, and tourist-counter pricing is not necessarily cheap.
Buying an eSIM in Hong Kong before you fly: it provisions right after payment, and works the moment you land and enable roaming. Questions go to a Hong Kong team on WhatsApp instead of an airport counter.
Which suits you? Short on time and want it easy — buy the eSIM before flying. Phone without eSIM support and no time for delivery — buy a physical SIM from us first (1–3 working days by post); the airport counter is the genuine last resort.
Matching days to your trip
- Days count from the first connection to a Thai network, not the purchase date — buying early costs nothing.
- Add a buffer day for red-eye flights: early-hours arrivals and delays make the real day count higher than you think.
- Thailand plus neighbours: crossing to Laos, Cambodia or Vietnam? Look at multi-country Southeast Asia plans — one SIM, no swapping.
How many GB?
- Navigation + messaging + restaurant reviews → roughly 1GB a day.
- Constant stories and live streaming → 2GB a day or more.
- Island resorts with unreliable Wi-Fi → size up or choose a daily plan; even throttled fallback keeps messaging alive.
- Unsure? Estimate from your own habits with our Data Calculator.
eSIM or physical SIM?
If your phone supports eSIM (dial *#06# and look for an EID), choose eSIM — instant. Physical SIMs suit phones without eSIM or a family member's older handset, mailed free within Hong Kong.
Live prices for every Thailand plan are on the Thailand destination page, with the cheapest plan per data-type × duration combination at a glance.
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