Internet in Thailand: A Traveller's Guide
Updated: October 2026
Short answer: you can buy a tourist SIM in Thailand, but passport registration is compulsory and the airport queue after a long-haul flight is a drag. The Thailand eSIM is installed at home; the moment you land in Bangkok, you can call a Grab.
Your options
1. Roaming on your home SIM: Thailand is a day-pass destination for most carriers, roughly five to ten pounds or dollars a day depending on yours, and pay-as-you-go rates are several times the cost of an eSIM per gigabyte. Over a ten-day holiday the difference is real money (our roaming vs eSIM guide).
2. A local tourist SIM: AIS, True and dtac sell tourist packages at the airports, and 7-Elevens stock SIMs too. In every case, registration with your passport is compulsory. Waiting in a queue at Suvarnabhumi after a long-haul flight is not a great start to a holiday.
3. eSIM: Set it up at home; there is no registration step. When the plane lands, your phone joins the Thai network by itself, and your Grab is at the door as you leave the terminal.
The coverage reality
- Coverage is strong in the tourist areas: Bangkok, Chiang Mai, Phuket, Krabi and Koh Samui; 5G is common in the big cities.
- On a boat between islands the signal fades in open water and returns as you near the shore.
- In remote coves and deep inside the national parks reception can drop; agree your meeting point by message before a day trip by boat.
Practical tips
- In Thailand, the taxi is called Grab; using the app instead of haggling is both cheaper and transparent, and it does not work without data.
- On a street-food crawl a translation app is a lifesaver; most menus are in Thai only.
- For the route, our Thailand route guide covers the balance between Bangkok and the islands.
Ready? See the Thailand eSIM plans; the options for a ten-day holiday are ready.