Thailand is one of the easiest countries in Southeast Asia for tourists — except when it comes to getting a SIM card at 2am in Suvarnabhumi Airport after a 14-hour flight.
The good news: data in Thailand is cheap. The question is how you get it.
Option 1: Travel eSIM (fastest)
Set up before you leave. Land in Bangkok, turn on your phone, you're online.
Thailand eSIM plans run on AIS, DTAC, or TrueMove H networks. All three have excellent 4G coverage across the country, including islands like Koh Samui and Koh Phangan.
Typical prices:
- 1GB / 7 days: ~$3
- 5GB / 15 days: ~$8
- 10GB / 30 days: ~$15
- Unlimited / 7 days: ~$18-25
Pros: Instant connection at landing, no airport queues, keep your home number. Cons: Phone must support eSIM, data only.
Best for: Most travellers. The convenience of landing with data already working is worth the small premium over a local SIM.
Option 2: Tourist SIM at the airport
Thailand makes it easy for tourists to buy SIMs. All three carriers (AIS, DTAC, TrueMove H) have counters at Suvarnabhumi and Don Mueang airports.
Typical prices:
- AIS Traveller SIM: 299 THB (~$8.50) for 15GB / 8 days
- DTAC Happy Tourist: 299 THB for 15GB / 8 days
- TrueMove H Tourist: 299 THB for 15GB / 8 days
Pros: Very cheap, generous data, includes some call minutes. Cons: 20-40 minute queue at airport counters (especially late at night), need passport, lose access to your home number.
Best for: Budget travellers on longer stays, or if your phone doesn't support eSIM.
Option 3: Free WiFi
Thailand has decent free WiFi in tourist areas. Most hotels, cafes, malls, and 7-Elevens offer it. But the moment you step onto a tuk-tuk or a longtail boat, you're offline.
Best for: Backup only.
Option 4: Roaming
International roaming in Thailand costs $8-15/day with most Western carriers. For a two-week trip, that's $112-210. A Thai tourist SIM costs $8.50 total.
Best for: Nobody. Seriously.
Thailand-specific tips
Grab is essential. Thailand's Uber equivalent needs data to work. Without it, you're negotiating with tuk-tuk drivers who'll charge you 3x the normal fare.
Island connectivity varies. Koh Tao and smaller islands have weaker signal. AIS generally has the best coverage on islands.
7-Eleven is everywhere. If you buy a local SIM and need to top up, any 7-Eleven can do it. There's one on literally every block in Bangkok.
LINE, not WhatsApp. Thais use LINE for messaging. If you need to contact a hotel or tour operator, download LINE before you go.
Our recommendation
eSIM for convenience, airport SIM for maximum value. Both are excellent options in Thailand. The difference is whether you want data working at landing (eSIM) or are happy to queue for 20 minutes at the airport counter (local SIM).
Related: What Is an eSIM? · Internet in Japan
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