Asia cruise eSIM: data in every port

Singapore and Hong Kong round trips, Japan coastal loops and Vietnam to Thailand routes. The eSIM gives you local data the moment the ship docks; at sea, ship Wi-Fi is the only option, and this page tells you how to avoid the satellite bill on your home SIM.

12/12

ports with local data

$25.30

whole route, 10 per-country plans

charges at sea if the eSIM line is off

One eSIM for the whole route

Asia-20: 10GB · 30 days · $35.09

Covers every port country on this itinerary. Per-country plans instead: $25.30 for 10 plans.

See plan

Port by port

Smallest plan of 7 days or more per country, live price. Ports marked ship Wi-Fi only have no Slashtel plan today.

Port	Country	Covered by	Per-country plan
Singapore	Singapore	Asia-20	1GB · 7d · $2.69	Plans
Penang	Malaysia	Asia-20	1GB · 7d · $1.69	Plans
Phuket	Thailand	Asia-20	1GB · 7d · $2.29	Plans
Laem Chabang (Bangkok)	Thailand	Asia-20	1GB · 7d · $2.29	Plans
Ho Chi Minh City	Vietnam	Asia-20	1GB · 7d · $2.59	Plans
Hong Kong	Hong Kong SAR China	Asia-20	1GB · 7d · $2.49	Plans
Shanghai	China	Asia-20	1GB · 7d · $2.99	Plans
Tokyo	Japan	Asia-20	1GB · 7d · $2.29	Plans
Kobe	Japan	Asia-20	1GB · 7d · $2.29	Plans
Busan	South Korea	Asia-20	1GB · 7d · $2.59	Plans
Manila	Philippines	Asia-20	1GB · 7d · $2.59	Plans
Benoa, Bali	Indonesia	Asia-20	1GB · 7d · $3.09	Plans

Coverage along the route: gold = Asia-20, navy = per-country plan, grey = ship Wi-Fi only

At sea versus in port: the routine that avoids a satellite bill

Before sailing	Install the eSIM on Wi-Fi at home. Turn off mobile data and data roaming on your home SIM for the whole trip; keep it on for calls and SMS only.
Leaving port	Switch the eSIM line off (Settings, Mobile Data, the eSIM line, off). Do this as the ship pulls out, not when you notice the bars fade.
At sea	Airplane mode plus Wi-Fi is the safe setting. The ship's cellular network (often shown as Cellular at Sea or a maritime carrier) bills your home SIM at satellite roaming rates.
Arriving in port	When you can see the terminal, turn the eSIM line back on and set it as the data line. Maps, ride apps and messaging run on local data at the plan price.
Running low	Add data to the same eSIM from your account; nothing to reinstall. On most plans the days start on first connection, not at purchase.

Questions

Will my eSIM work on the cruise ship?

In port and for a few kilometres out, yes: your phone uses the local network like any visitor. Once the ship is at sea there is no land network, and the ship's own cellular system bills your home SIM at satellite rates, so switch the eSIM line off and use ship Wi-Fi or airplane mode until the next port.

Do I need one eSIM per port on a Asia cruise?

No. One Asia-20 plan covers every port country on this route with a single eSIM (10GB for 30 days at $35.09). Buying per country instead comes to about $25.30 for 10 plans.

What about Cellular at Sea charges?

The ship's maritime network appears as a normal roaming partner to your home SIM and charges several dollars per megabyte. Turn off mobile data on your home SIM before sailing and keep the eSIM line off between ports; enable it again when you can see the port.

Can I keep WhatsApp working at sea?

Only over the ship's Wi-Fi package. In port, WhatsApp, maps and ride apps run on the eSIM data. Messages sent while at sea deliver when you reconnect.

How much data for a 7 to 14 nights cruise?

Port days are short, so 3GB to 5GB covers maps, messaging and photos for a week of stops; add 5GB if you stream or upload video in port. Top-ups add data to the same eSIM without a new install.

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Live catalogue prices as of 2026-11-12. Coverage means a land network in port; nothing here works at sea.