AIS vs. True-dtac: Which Network Has Better Island & Mountain 5G?
- AIS (Green Logo): Thailand's #1 network for offshore marine coverage (Maya Bay, Similan Islands, Koh Lipe, Ang Thong, and Doi Inthanon mountain highways).
- TrueMove H / dtac (Red/Blue Merged Network): Excellent urban 5G speed in Bangkok, Chiang Mai, Phuket, and Koh Samui.
- Passport Registration Required: All Thai SIMs and local eSIMs require a quick passport scan at activation. Tourist unlimited-data packages cost ฿299–฿599 for 8–15 days.