## eSIM for Koh Chang and the Eastern Gulf Islands
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Thailand’s eastern Gulf islands — Koh Chang, Koh Mak, and Koh Kood — sit near the Cambodian border province of Trat, less visited than the Gulf’s famous Samui-Phangan-Tao triangle or the Andaman islands. That’s precisely their appeal: jungle-covered hills, empty beaches, and a pace that feels genuinely relaxed.
### Koh Chang: The Main Island
Koh Chang is Thailand’s second-largest island. The west coast has the main tourist infrastructure (White Sand Beach, Lonely Beach, Kai Bae); the east coast and interior are substantially more remote.
**White Sand Beach (Hat Sai Khao)**: Good 4G. The main tourist strip has solid coverage.
**Lonely Beach**: Reasonable 3G–4G. Backpacker hangout with sufficient connectivity.
**Kai Bae**: 3G–4G.
**Bang Bao fishing village** (south pier): 3G coverage.
**Klong Phrao**: Good 3G–4G on the main beach road.
**East coast**: Limited coverage. The road around the east side of the island passes through genuine jungle — download offline maps before attempting.
### Koh Mak: The Quiet Alternative
Koh Mak is a fraction of Koh Chang’s size, no motorbike taxis, mostly coconut plantations and bungalows. Coverage: reasonable 3G in the main areas around Ao Kao beach.
Koh Mak is the island for genuine disconnection with minimal infrastructure — including connectivity infrastructure. Use the eSIM for essential messaging; accept the slower pace.
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### Koh Kood: The Most Remote
Koh Kood (Ko Kut) is Thailand’s fourth-largest island and the least developed of the accessible eastern islands. Pristine jungle, waterfalls, minimal tourism infrastructure.
**Coverage**: Patchy 2G–3G in the main bungalow clusters. Not reliable for anything beyond WhatsApp messaging.
Koh Kood visitors should regard mobile connectivity as a bonus, not a given. Download everything required before boarding the ferry from Laem Sok or Trat.
### Getting There from Bangkok
The eastern Gulf islands depart from Trat province:
– **By bus**: From Bangkok Eastern Bus Terminal to Trat (4–5 hours), then connecting ferry
– **By flight**: Bangkok → Trat (1 hour, Bangkok Airways) then ferry
– **Hua Hin Ferry**: Seasonal service direct from Hua Hin avoids Bangkok entirely
Book via 12go.asia with your Airalo eSIM. Good coverage throughout the bus journey from Bangkok.
### The Cambodia Overland Connection
From Trat province, the Hat Lek crossing into Cambodia (Koh Kong province) is easy. For this:
– Your Thailand eSIM deactivates at the border
– A Southeast Asia regional plan or Cambodia eSIM activates immediately in Koh Kong
– Koh Kong town has reasonable 3G–4G
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### FAQ
**Does Airalo work on Koh Chang?**
Good 4G on the main west coast tourist strip (White Sand Beach, Kai Bae). East coast and interior are limited.
**Is there coverage on Koh Kood?**
Patchy 2G–3G in bungalow areas. Koh Kood is the most disconnected of the eastern islands — prepare offline before departure.
**How do I get to Koh Chang from Bangkok?**
Bus to Trat (4–5h) + ferry (45 minutes). Book full combination via 12go.asia. Alternatively fly to Trat (1h, Bangkok Airways).
**Can I combine Koh Chang with a Cambodia trip?**
Yes — the Hat Lek/Cham Yeam border crossing to Koh Kong, Cambodia, is nearby. Easy overland connection to Sihanoukville and Phnom Penh.
**How much data for a Koh Chang trip?**
2–3GB for a week. Most time is on beaches or jungle trails with minimal connectivity needs.