Quick answer
Sihanouk International Airport (KOS) serves Sihanoukville and is the usual way in for boats to Koh Rong and Koh Rong Sanloem. Install a Cambodia eSIM before you fly and turn on Data Roaming for it when you land, so you can arrange the ride to town or the pier and check your ferry booking.
Why use an eSIM at Sihanouk Airport?
Most people landing at KOS are heading on somewhere: a hotel in Sihanoukville, or a boat to the islands. With data you can message your hotel or ferry company, show e-tickets, and follow the route on a map without hunting for Wi-Fi.
Your home SIM can stay in the phone for SMS and bank codes, while the Cambodia line handles data.
How do I get from the airport to town or the pier?
Taxis and hotel transfers are the simple options. Ride-hailing apps are common in Cambodia’s bigger cities, so check Grab or PassApp when you land to see what is available. If you are catching a boat the same day, leave yourself time between landing and the departure, and keep your ferry company’s messages handy.
Will the eSIM work on the boat and the islands?
Coverage depends on the Metfone network. In Sihanoukville and the main island villages you can usually get online, but signal can be patchy on the crossing and on remote beaches. Screenshot your ferry ticket, hotel address, and pickup details before the boat leaves.
Frequently asked questions
Can I install the eSIM at Sihanouk Airport?
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Yes, on airport Wi-Fi. Open the QR from your email or order page on a second screen, or use the manual install code. Installing before the trip is easier.
Is there signal on Koh Rong and Koh Rong Sanloem?
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Usually in the main villages and busier beaches, depending on the Metfone network. Expect weaker or no signal on remote beaches and in open water.
Can I share data with a friend on the islands?
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Yes. Hotspot is included, so you can share your connection with another phone or a laptop. It uses your plan’s data.
Related guides
Sihanoukville eSIM guide: Koh Rong, Koh Rong Sanloem, and the coast
Ferry piers, island beaches, and slow days by the sea.
How much data do I need in Cambodia?
Rough numbers for maps, social media, video, and work.
How to install a Cambodia eSIM on iPhone
Scan the QR, label the line, and turn on Data Roaming.
Cambodia eSIM not working? Fixes for no data after landing
Five checks to run in the arrivals hall.