Whether shipboard WiFi is worth buying depends on what you need it for — satellite internet has improved enough for messaging and email everywhere and video on many ships — but the more important setting is airplane mode, because a phone left on at sea connects to the ship’s maritime network and bills separately from any package you bought.
Two things about phones at sea have changed in opposite directions. Ship internet has got dramatically better in the last few years and most advice you will read about it is out of date in your favour. Meanwhile, the way a phone bills itself when it is out of sight of land has not changed at all, and it is still the mechanism that produces the occasional horror story. The good news is that avoiding it is a single setting, applied once, on the first day.
Ship WiFi is not what it was, and the old advice is stale
For most of cruising’s history, internet at sea meant a geostationary satellite dish pointing at a spacecraft parked extremely far above the equator. That produced a connection with a long, unavoidable delay built into it — fine for an email, hopeless for a video call, and prone to failing entirely at high latitudes. That is where the conventional wisdom about cruise internet came from, and it was accurate at the time.
The mainstream and premium fleets have since moved to low-earth-orbit satellite service, where the spacecraft are far closer and far more numerous. The practical result is that the delay largely disappears, the connection holds in places it previously did not, and things that used to be impossible aboard — video calls, streaming, working remotely, a VPN back to an office — are now routine on a great many ships. This is not a marginal improvement. It is a different product with the same name.
It is not universal, though. Older ships awaiting refit, smaller operators, some expedition and river vessels, and certain sea areas where service is restricted for regulatory reasons all fall outside the general picture. And even on a well-equipped ship the connection is shared by several thousand people, which makes the evening after dinner the slow hour on any vessel afloat, exactly as in a hotel.
How the packages generally work
The shape of the offer is consistent across the industry even where the names differ. Lines typically sell internet by the voyage rather than by the day, in tiers, and per device — with the number of simultaneous devices being the thing people most often get wrong when buying for a family.
The lower tier is usually described as messaging or surfing: enough for chat apps, email, social media and browsing, with streaming and video calling blocked or throttled rather than merely slow. The upper tier lifts those restrictions. If you intend to make video calls home, join a work meeting or watch anything, the lower tier will frustrate you regardless of how good the ship’s connection is, because the limitation is a policy rather than a bandwidth problem.
Three mechanisms are worth knowing about. Packages are almost always cheaper bought before you sail than at the desk on day one, so this is a decision to make at home. Loyalty programmes and some suite categories include internet outright, which is worth checking before you buy anything. And a single-device package can usually be logged out of one phone and into another, which for a couple who mostly want to check messages in the evening is often all that is needed.
The expensive mistake: the ship's cellular network is not the WiFi
This is the part that matters most and the part almost nobody explains properly, so here it is plainly.
A cruise ship carries two entirely separate communications systems. One is the WiFi network you buy a package for. The other is a maritime cellular network — a small mobile mast aboard the ship, run by a specialist maritime operator, which exists so that phones aboard can register on something once the ship is out of range of land. They are different companies, different systems and different bills.
Your phone does not know or care about the distinction. Left off airplane mode, it will find the ship’s mast and register on it exactly as it registers on any network abroad, and everything it does after that — calls, texts, background app refreshes, photo backups, software updates, all of it happening silently in your pocket — bills as maritime roaming through your own carrier. Maritime roaming sits outside almost every ordinary plan. It is generally excluded from domestic unlimited allowances, and it is usually excluded from international roaming add-ons and travel passes too, because those are negotiated with land-based networks in named countries and a ship is not a country.
And here is the sentence to take away: buying the ship’s WiFi package does not protect you from this. People assume that having paid the cruise line for internet, they have paid for their phone. They have not. The two bills arrive from two different companies, and only one of them appears on your onboard account.
Airplane mode, applied properly
The discipline is simple and it needs to be deliberate rather than occasional. Put the phone into airplane mode as you board, before the ship sails, and then turn WiFi back on by itself. Airplane mode kills the cellular radio; switching WiFi back on afterwards leaves you connected to the ship’s network and nothing else. That combination — airplane mode on, WiFi on — is the correct setting for an entire cruise and it is what most experienced cruisers run without thinking about it.
Do it before the ship leaves, not after. The mast aboard typically comes into use once the vessel is beyond land coverage, and the transition is silent. Nobody gets a warning. A phone left alone overnight can do a surprising amount of work by itself while you are asleep, and background data is where most unexpected charges actually come from rather than from calls anyone consciously made.
Two extra belts for the braces, if you want them. Most carriers will block or bar maritime and international roaming on the account before you travel, which removes the possibility entirely. And on both major phone platforms you can switch data roaming off separately from airplane mode, which is a useful second layer if someone in the party is likely to toggle airplane mode off.
Do turn airplane mode off ashore, deliberately and with your eyes open. Once you are standing in a port you are on that country’s ordinary land network, and a normal international roaming plan or a local eSIM works exactly as it would on any other holiday. The rule is not “airplane mode all week”. It is “airplane mode at sea, land network ashore, and never the ship’s mast”.
Calling home without paying the ship for the privilege
Once you are on the ship’s WiFi with the cellular radio off, calling home works the way it does anywhere else with WiFi. The chat and video apps your family already uses will work on a suitable package. WiFi calling — the setting on most modern phones that routes ordinary calls and texts over an internet connection instead of a mobile network — will generally work too, and it means people can reach you on your normal number without either of you touching the maritime network. It is worth enabling that setting before you leave home and confirming it works, because it is easier to test on your own sofa than in a corridor on deck nine.
For the people staying behind, the useful thing to hand over is not your mobile number. It is the ship’s name, the cruise line’s emergency contact number for passengers, and your cabin number. Every line operates a shoreside number through which a genuine family emergency can reach a passenger aboard, and that channel works whether or not your phone is on, whether or not you bought internet, and whether or not you are ashore in a port at the time. It is the actual answer to “what if something happens at home”, and it is a better answer than an internet package.
There is also a satellite telephone in every cabin. Treat it as an emergency device rather than a way of saying goodnight to the grandchildren.
Deciding, honestly, whether to buy anything
The case for buying is straightforward. If you have obligations that do not pause for a holiday, if you are travelling alone and value the contact, if you have people at home who will worry, or if you are on a long itinerary with many sea days, the package removes a background anxiety and that is worth something regardless of how much you actually use it. Solo travellers in particular tell us the connection matters more than they expected — our solo cruising guide covers the rest of that ground.
The case against gets less airtime. A cruise is one of the few remaining holidays with a built-in excuse to be unreachable, and the sea days are where that is most valuable. Plenty of experienced cruisers buy nothing, use the free port-day WiFi in a café ashore to check in once or twice, and consider it one of the better decisions they make all year.
A workable middle path: buy the cheapest tier for one device, keep airplane mode on, check messages once in the morning and once in the evening, and use the land networks ashore for anything that needs real bandwidth. That covers the reachability problem without turning the holiday into a commute. If this is your first cruise and you are still building a picture of how the week works, the first-time cruise guide puts this alongside the other decisions worth making before you sail rather than at the desk on day one.
Common questions
Do cruise ships have WiFi at sea?
Yes, by satellite, and quality has improved substantially on newer fleets.
Why is my phone bill high after a cruise?
Maritime roaming, which is billed separately from the ship’s WiFi package.
Should you keep airplane mode on?
Yes at sea; turn it off deliberately only on a land network ashore.
Can you make calls from a cruise ship?
Over WiFi calling, generally yes. Over the cellular network, expensively.
Is WiFi worth it for a week?
If you need to stay reachable for work or family, usually. For a genuine break, the argument goes the other way.
Does buying the ship's WiFi stop roaming charges?
No, and this is the assumption that produces the large bills. A cruise ship carries two entirely separate systems: the WiFi network you buy a package for, and a maritime cellular mast run by a different company altogether. Paying the cruise line for internet does nothing about the second one. If your phone is left off airplane mode it registers on that mast and bills through your own carrier as maritime roaming, which arrives as a separate bill that never appears on your onboard account.
Does your international roaming plan cover a cruise ship?
Usually not. Travel passes and international add-ons are negotiated with land-based networks in named countries, and a ship at sea is not a country — so maritime roaming generally sits outside them, just as it sits outside domestic unlimited allowances. Check with your carrier specifically about maritime or cruise-ship roaming rather than assuming your existing international package extends to it. Some carriers sell a separate cruise add-on; most treat the ship as an entirely different category.
How do you stay reachable in an emergency at sea?
Give someone ashore the ship’s details rather than relying on your mobile. Every cruise line publishes a number for reaching a passenger aboard in a genuine emergency, and the ship can locate you and pass a message. Leave that number, your ship name, sailing dates and cabin number with whoever might need it before you travel. That way your phone can stay in airplane mode all week without anyone at home feeling cut off, which is the arrangement that actually works.
How many devices does a WiFi package cover?
Usually one, and this is the detail families most often get wrong when buying. Packages are typically sold by the voyage, in tiers, and per device — so a family of four expecting to share a single package will find only one of them online at a time. A single-device package can generally be logged out of one phone and into another, which for a couple who mostly want to check messages in the evening is often all that is needed. Buy before you sail; it is almost always cheaper than at the desk.
Two rules, and everything else is detail. Airplane mode goes on before the ship sails and WiFi goes back on by itself — that is the whole defence against the only genuinely expensive mistake available here. And buy the internet package before you leave home if you are going to buy one at all, at the tier that matches what you actually intend to do rather than the cheapest one.
Beyond that, the honest advice is to be sceptical of anything you read about cruise internet that is more than a couple of years old, because the technology genuinely moved and most of the received wisdom has not caught up. If you want to know what to expect on your specific ship, ask us — we answer within one business day, so you are not left guessing about it from the middle of the ocean.