Thailand is one of the world's most popular island-hopping destinations. The classic route — Bangkok → Koh Samui → Koh Phangan → Koh Tao, or the Andaman coast version → Phuket → Phi Phi → Krabi → Koh Lanta — involves multiple boat connections, accommodation bookings on the go, and navigation in areas where signal can be patchy. Here's the Thailand island eSIM guide for 2026.
Thailand Islands: Which Has the Best Coverage?
Gulf of Thailand (eastern islands):
- Koh Samui — excellent coverage from AIS, DTAC, and True Move in Chaweng and Lamai; weaker inland
- Koh Phangan — good coverage in Haad Rin (Full Moon Party area) and Ban Tai; weaker in the jungle interior
- Koh Tao — decent AIS and True Move coverage in Mae Haad and Sairee Beach; some dead zones on the east coast
- Koh Chang — solid coverage on the main west coast; eastern and southern parts of the island are limited
Andaman Sea (western islands):
- Phuket — excellent coverage everywhere; all carriers perform well
- Phi Phi Islands — Phi Phi Don has good coverage; no coverage on Phi Phi Leh (Maya Bay)
- Krabi / Railay Beach — Railay is accessible only by boat; coverage from AIS on main beach areas
- Koh Lanta — solid AIS coverage on the main tourist strip; weaker in the south
- Koh Lipe — patchy; AIS is your best option but signal is inconsistent
Why AIS Is the Best Network for Thai Islands
Among Thailand's three main carriers (AIS, DTAC/True Move, and True Move H), AIS consistently has the widest island coverage. The difference is most pronounced on smaller or less-developed islands like Koh Tao, Koh Chang, and Koh Lipe where DTAC and True Move have significantly fewer towers. International eSIM plans routing through AIS give you the best shot at maintaining signal across the widest range of island destinations.
Essential Apps for Thailand Island-Hopping
- 🛥️ Lomprayah and Seatran Discovery apps — the two main ferry operators; book and track boats between Gulf islands
- 🚖 Grab — available in Phuket, Krabi town, and some Koh Samui areas; reliable and metered
- 🌡️ Weather apps (Windy, Windfinder) — essential for kite surfing and sailing conditions; monsoon season can affect ferry schedules
- 🤿 Dive shop booking platforms — Koh Tao is the world's most popular scuba diving destination; book PADI courses online before you arrive
- 🗳️ Full Moon Party schedule apps — Koh Phangan's party calendar, accommodation booking during event weekends
Thailand Island eSIM Plans 2026
- 1GB / 7 Days — $7.99 — short Phuket or Samui beach break
- 5GB / 30 Days — $9.99 — island-hopping trip covering 2–3 islands
- 10GB / 30 Days — $15.99 — full Thai island circuit, heavy ferry app use
- Daily 3GB · 7 Days — $25.99 — content creators during Full Moon Party or dive certification week
🛒 Get Your Thailand eSIM Now
AIS network • Island coverage • From $6.99