A travel eSIM works well across Thailand's main islands, including Phuket, Koh Samui, Krabi and Koh Phangan, on one of Thailand's main 5G networks (AIS, TrueMove H or dtac) where available. It is data-only, so you keep your own number.
What to expect by island
The popular islands have strong coverage in the towns and along the main beaches. Speeds can thin out on the quieter beaches, smaller islands and during ferry crossings, as on any network. For those, a little preparation goes a long way.
Before ferries and remote beaches
- Download offline maps of the island and your route.
- Save your ferry and accommodation bookings.
- Queue up music or shows for the crossing.
Back in coverage, the eSIM reconnects automatically and your photos upload.
How much data
Island trips lean on maps, messaging and a lot of photos. A week island-hopping fits comfortably in 10 to 15GB; heavy uploaders should size up. See how much data for two weeks in Thailand.
Frequently asked questions
Does the eSIM work on Koh Samui and Phuket? Yes, on 5G where available, strongest in the towns and main beaches.
Will I have signal on the ferry? Often near shore, with gaps mid-crossing. Download maps and bookings in advance.
Which network does it use? One of AIS, TrueMove H or dtac, where available.
Browse Thailand eSIM plans and read trust and safety.