Travel eSIMs on a cruise: what works in port and at sea

A travel eSIM on a cruise works the way your phone works on land: it needs a local mobile network. That means it works in port, at anchor and close to the coast, and not out at sea.

The short answer: ports and coast yes, open sea no

A travel eSIM connects to the same land networks that local phones use, so it works wherever the ship is close enough to reach one.

We do not sell a plan for use at sea. Between ports, plan to be offline or to pay for the ship's own internet package.

Why your phone loses signal at sea

Your phone loses signal at sea because the land network's towers only reach a limited distance from the shore. Once the ship is out of range, the only network left is the one the ship runs itself, usually over satellite.

That ship network is not part of any travel eSIM we sell. Your home SIM, however, may try to join it if roaming is on, and home carriers bill it separately from their usual roaming. Spark's roaming rates page, read on 11 October 2026, says its roaming packs do not work on cruise ships. Check your own carrier's page before you sail.

Before you sail: settings that stop a surprise bill

Set your phone up before you board so only the eSIM ever uses data.

1. Install the eSIM at home on wifi, a few days before you leave.
2. Set the eSIM as your mobile data line.
3. Turn Data Roaming off for your home line, and on for the eSIM line.
4. At sea, switch on airplane mode, then turn wifi back on for the ship's network.
5. In port, turn airplane mode off and give the eSIM a minute to find the local network.

The Oceania plan also covers New Zealand and Australia, so it starts as soon as it connects there. If you sail from Auckland, Sydney or Brisbane on it, keep its line switched off until the first port where you want data, then follow steps 2 and 3.

Your home SIM can stay on for texts such as bank codes when you are in port, with its Data Roaming off. Our guide to keeping your home number explains how calls and texts reach you while the eSIM does the data.

South Pacific cruises from Auckland, Sydney and Brisbane

One Oceania plan covers most South Pacific ports, and New Caledonia is the gap. The Oceania plan covers exactly eight places: Fiji, Vanuatu, Tonga, Samoa, Papua New Guinea, Nauru, Australia and New Zealand.

The Oceania plan covers every port in the table except those in New Caledonia: 3GB for 15 days is US$16.90 and 5GB for 30 days is US$28, less than the Samoa, Tonga or Vanuatu plan of the same size.

New Caledonia and French Polynesia are on none of our regional plans and their own plans cost far more, so for a single port day the ship's wifi may be the better buy. We have no plan for the Cook Islands. Our Pacific Islands guide goes island by island.

Mediterranean, Caribbean, North America and Asia cruises

Regional plans cover many other cruise routes, but rarely every port, so check each port against the plan's list first.

• Mediterranean and northern Europe. Our widest Europe plan covers 43 countries. 10GB for 30 days on a Europe plan starts at US$14.10, though the cheapest Europe plans leave some countries out, so check your ports on the Europe page.
• North America. The North America plan covers the United States, Canada and Mexico on one eSIM: 10GB for 30 days is US$36. We have not yet confirmed coverage in every Alaska port, so for an Alaska cruise, ask us before you buy.
• The Caribbean. Our Caribbean plan covers 16 Caribbean islands and territories, among them Jamaica, Barbados, Puerto Rico and the Cayman Islands, and some South American countries as well. 5GB for 30 days is US$62.20. Several busy cruise ports are not on it: the Bahamas, Aruba, Curaçao and Belize each need their own plan, and Cozumel is in Mexico, on the North America plan. Check every port on the Caribbean page.
• Asia. One of our Asia plans covers Japan, South Korea, Hong Kong, Taiwan, Singapore, Vietnam and Thailand together. Asia plans start at US$4.10 for 1GB, and each list is on the Asia page.

Sea days still count: sizing a plan for 7, 10 or 14 nights

Once a plan first connects, its days run every day until it ends, sea days included. A plan that starts in your first port must last until your last one.

So pick the validity first, then the data. For a 7 night cruise, a plan valid for at least 7 days from the first port; for 10 or 14 nights, a 15 or 30 day plan. Our country plans start when they first connect in a covered country, so a plan installed at home waits until the ship reaches one. The Oceania plan covers New Zealand and Australia too, so it waits only while its line is switched off.

Data goes further than on a land holiday, because you are offline at sea. Across our travellers, the median day online used 470MB (July to October 2026), so 3GB covers a handful of busy port days, and 5GB leaves room for photos and video calls home.

Ship wifi or an eSIM: when the ship's package is the better buy

Buy the ship's wifi package if you need to be online between ports, because nothing else works there. Work email, a family member at home or a long run of sea days all point to the ship's package.

An eSIM is the better buy for port days. A local network is usually faster than ship wifi, and the eSIM keeps working when you walk into town, ride a tour bus or take a boat to a beach. Many cruisers use both: the ship's package at sea and the eSIM ashore.

If you skip the ship's package, set your phone up as above and enjoy the quiet between ports.

Shore days: offline maps, the meeting point and the all aboard time

Plan each port day as if the signal might drop, because on small islands it often does.

• Download offline maps of each port before you arrive, on the ship's wifi or at home.
• Save the ship's all aboard time and the port agent's phone number on paper or in a photo.
• Agree a meeting point with your group in case phones run flat or lose signal.
• Keep some local cash for tenders and markets, where card readers may need a signal too.

Our guide to remote areas and backup plans has more on travelling where coverage thins out.

Prices for popular trips

• Oceaniafrom US$7.60
• Fijifrom US$5.70
• Vanuatufrom US$8
• New Caledoniafrom US$53.20
• Europefrom US$3.40
• Caribbeanfrom US$14.60

Cheapest plan with 1GB or more, in US dollars from our catalogue, updated 27 Sep 2026.