Cellular at Sea Disclosure Index: What 10 Cruise Lines Tell Passengers About Roaming Charges
Only two of the ten cruise lines in this study clearly explain how a phone that looks idle can create maritime cellular use. Carnival and Celebrity publish examples involving background data, incoming activity, voicemail or similar passive-looking behavior. The other eight reviewed source sets do not give passengers the same direct explanation.
The more basic facts are much easier to find. All ten lines identify an onboard cellular or maritime roaming service and tell passengers that the home mobile carrier controls the bill. Nine recommend airplane mode or turning cellular service off. Seven explain automatic activation, and seven publish a boundary involving port, shore or a stated distance from land.
Study result: only 2 of 10 reviewed cruise-line source sets clearly explain passive phone activity. A passenger can understand who sends the bill on every line in the sample, but may still miss what causes the usage.
This is a disclosure study, not a bill simulation. We did not trigger a day pass, place a call, send a text or leave a phone connected at sea. The result measures what a traveler can verify on current first-party passenger pages before sailing.
Download the Cellular at Sea CSV or open the JSON dataset. The JSON contains the fixed sample, six field definitions, source-search rule, 22 reviewed first-party URLs, ten ranking pages, ten public traveler questions, source checksums and a checksum for every normalized cruise-line record.
Which phone setup fits each part of a cruise?
| Where you are | Connection decision | What to verify |
|---|---|---|
| At sea without a maritime plan | Put the phone in airplane mode before terrestrial coverage disappears, then leave cellular service off. | Confirm that the cellular radio is off, not only data roaming. |
| At sea with ship Wi-Fi | Keep airplane mode on and turn Wi-Fi back on according to the cruise line's instructions. | Confirm that the phone has not re-enabled a cellular line or data switching. |
| At sea with a carrier cruise pass | Use it only if the exact ship, network, allowance, trigger and billing rules are acceptable. | Check whether calls, texts, background data and voicemail can activate or consume the pass. |
| Approaching a port | Do not assume that seeing land means the maritime network is off. | Wait for a supported terrestrial network name and check which line is selected for data. |
| In a covered port | Use Roaming eSIM as the mobile-data line on a compatible unlocked phone. | Confirm that the destination appears in the selected plan and that the maritime network has disappeared. |
| Using the home number for calls or texts | Treat the home line as a separate roaming decision. | Ask the home carrier about calls, SMS, voicemail, Wi-Fi Calling and data switching. |
| Several family phones | Configure every device separately before departure. | A safe setting on one phone does not apply to the other phones on the account. |
Explore the ten-line CSV
Compare what each cruise line publishes about maritime roaming
Search a cruise line, isolate one decision field, and open every first-party page used for the classification. Not published describes the reviewed source set, not an assumed onboard policy.
Loading the cruise-line disclosure CSV...
What cruise lines publish about Cellular at Sea charges
The six fields describe decisions a passenger must make before the ship leaves terrestrial coverage:
- 10 of 10 identify the maritime cellular service or name the onboard network.
- 10 of 10 say the home mobile carrier determines or applies the charge.
- 9 of 10 publish airplane-mode or cellular-off guidance.
- 7 of 10 publish automatic connection or activation behavior.
- 7 of 10 publish a port, shore, territorial-water or distance boundary.
- 2 of 10 explain passive-looking phone activity such as background data, incoming activity or voicemail.
These counts do not say that one line has a better signal or lower bill. The score answers a narrower question: can a passenger understand the exposure from public guidance without filling the gaps with forum advice?
What "Not published" means: the defined answer was not found in the reviewed first-party source set on August 22, 2026. It does not prove that the cruise line never communicates the information elsewhere, and it does not establish how a particular carrier will bill a particular plan.
Every line tells passengers to check the home carrier
All ten cruise lines receive the carrier-billing point. That is useful, but it moves the final price question to another company. A cruise line can identify the network and still be unable to state the passenger's rate because the mobile carrier decides whether the event is pay per use, covered by a cruise pass or unavailable on the plan.
The practical check is specific. Ask the home carrier whether the chosen plan covers the exact ship or maritime network. Then ask what activates a charge: data registration, a completed call, an incoming call, a sent text, a received text, voicemail delivery or a fixed daily pass trigger. A general statement that international roaming is included does not answer whether maritime roaming is included.
Nine lines publish an airplane-mode instruction
Oceania is the only line in the sample whose reviewed pages do not explicitly recommend airplane mode or turning cellular service off. The result should not be read as proof that Oceania tells passengers to leave the phone connected. Its pages identify Cellular at Sea, tell passengers that the home carrier bills the service and state when the service becomes available. The prevention step is the missing field.
Royal Caribbean and Princess demonstrate why the study uses a source set rather than one FAQ URL. Their main cellular pages do not contain every answer. Separate first-party preparation or editorial guidance supplies the airplane-mode instruction. A one-page review would have undercounted both lines.
Seven lines publish when maritime service becomes available
Carnival, Norwegian, MSC, Holland America, Disney, Cunard and Oceania publish some form of port or shore boundary. The wording is not identical. A line may describe international waters, a distance from shore, availability away from port or a transition back to land service.
Royal Caribbean, Princess and Celebrity do not receive the boundary point because the checked sources did not give a sufficiently direct port or shore rule. That does not prove that the network remains active in port. It means the passenger cannot use the reviewed pages to decide exactly when it is safe to restore cellular service.
Carnival publishes all six decision fields
Carnival's cellular service page is the only reviewed cruise-line source set that receives all six points. It identifies the service and network names, explains automatic connection, assigns billing to the home carrier, gives airplane-mode guidance, describes the transition around port and lists passive-looking activity that can create use.
🏆 Documentation leader: Carnival publishes all six fields in the method. This is a transparency result, not a claim that Carnival has the cheapest maritime service or best onboard network.
Celebrity receives five points and is the other line that explains passive activity. Its evidence is spread across a current onboard FAQ, phone-package page, editorial guide and mobile-data document. The checked set covers network identification, automatic activation, carrier billing, airplane mode and passive use. The missing point is a direct port or shore boundary.
Norwegian, MSC, Holland America, Disney and Cunard also receive five points. Each publishes the network, automatic activation, carrier billing, airplane-mode prevention and a boundary. None receives the passive-use point under the strict definition.
Royal Caribbean and Princess receive three points. Both name the service, explain carrier billing and publish airplane-mode guidance, but the checked sets do not directly publish automatic activation, a port boundary or passive-use risk.
Oceania receives three points for network identification, carrier billing and a boundary. Its current help pages give passengers a useful description of Cellular at Sea and say the service becomes available around six nautical miles from shore, but the checked pages do not state automatic connection, an airplane-mode prevention step or passive-use examples.
Why passive phone use is the largest disclosure gap
A phone can create network activity without the passenger opening an app. Mail can refresh, photos can synchronize, software can check for updates and messaging services can receive data. Incoming calls, text delivery and voicemail behavior may also matter, depending on the home carrier and plan.
Cellular at Sea's own FAQ explains several of these possibilities. It says phones may connect automatically when the service is active and tells passengers to check the home carrier for rates. It also discusses background data, calls, text messages and voicemail. That provider documentation is useful, but a passenger who reads only the selected cruise line's preparation page may never reach it.
The gap matters because the phrase "I did not use my phone" can describe several different states:
- The phone was powered off.
- The phone was in airplane mode with Wi-Fi off.
- The phone was in airplane mode with ship Wi-Fi on.
- Cellular service was on but data roaming was off.
- Cellular service and data roaming were on, but no app was opened.
- The home line was active for calls and texts while another line handled data.
Those states are not equivalent. Only the home carrier can confirm how calls, texts, voicemail and a cruise pass behave on the exact plan. The cruise line can still reduce confusion by explaining the difference in the same place where it describes the onboard network.
Is turning off data roaming enough on a cruise ship?
Turning off data roaming limits one category of activity, but it does not necessarily disable the cellular radio. A phone may still register on a network, receive calls or texts, or use another enabled line. That is why nine of the ten cruise-line source sets recommend airplane mode or turning cellular service off instead of relying only on the data-roaming switch.
Airplane mode normally disables cellular radios. Wi-Fi can then be turned back on separately for the cruise app or a purchased ship package. Passengers should still check the status bar and line settings after changing modes because phones differ, Dual SIM settings add another layer, and a user can manually restore cellular service.
Safer at-sea starting point: use airplane mode before the maritime service becomes available. Turn Wi-Fi back on only if it is needed. Restore cellular service in port after the phone shows a supported terrestrial network.
This is a practical starting point, not a guarantee against every charge. A carrier pass may have its own trigger. Wi-Fi Calling may follow different terms. A home line left active for calls or texts remains a separate decision even when Roaming eSIM supplies mobile data.
Does ship Wi-Fi stop Cellular at Sea roaming?
Connecting to ship Wi-Fi does not, by itself, prove that the cellular radio is off. Wi-Fi and cellular service can operate at the same time. A phone may prefer Wi-Fi for some data while remaining registered on a maritime cellular network for calls, texts or fallback data.
The clearer setup is to put the phone in airplane mode first and then turn Wi-Fi back on. Follow the line's current onboard-app instructions because some cruise apps can use the guest network without a paid general internet package. Free app access is not the same as free web browsing, and it does not establish that the cellular line is disabled.
For the cost of general browsing at sea, use the separate Cruise Wi-Fi Price Index. That study compares the minimum publicly calculable seven-night browsing cost on ten cruise lines. This disclosure study deals with the other radio in the phone and the risk of maritime cellular billing.
Where Roaming eSIM fits on a cruise
Roaming eSIM destination and regional plans use supported terrestrial partner networks. They are not ordinary Cellular at Sea packages and should not be presented as offshore coverage. The useful role begins after the ship reaches a covered port and the phone has left the maritime network.
🏆 Roaming eSIM wins the covered-port data-line decision: one compatible unlocked phone can keep the home number installed while Roaming eSIM supplies mobile data on supported terrestrial networks. This separates port data from the home carrier's maritime roaming terms. Calls, SMS, voicemail and Wi-Fi Calling on the home line remain the home carrier's responsibility.
The public catalog checked on August 22, 2026 included four relevant starting points:
| Roaming eSIM plan | Current public choice on the snapshot date | Cruise use case |
|---|---|---|
| Caribbean, 20+ areas | 11 packages from $6, including fixed and daily allowances | Multi-island itineraries when every planned port appears in coverage |
| Europe | 11 packages from $3.20, including fixed allowances up to 50GB and daily options | Mediterranean, Baltic or Northern Europe ports covered by the selected plan |
| North America | 19 packages from $2.30, including fixed and daily options | United States, Canada and Mexico port days within the listed coverage |
| Global, 120+ areas | 9 packages from $8.90, including fixed and daily options | Itineraries spanning regions when the covered countries match the route |
These are dated public-catalog counts, not price promises for a later booking. Package availability, price, allowance, validity, hotspot support and top-up eligibility can change. Some current choices are reloadable and some are not, so the product card must show whether the selected package is eligible for top-up.
A practical port-day sequence
- Keep airplane mode on while the ship is at sea.
- Near port, check whether the maritime network name has disappeared.
- Turn on the Roaming eSIM line and select it for cellular data.
- Leave data switching off unless the consequences for the home line are understood.
- Confirm that the phone shows a supported terrestrial network before using data.
- Before departure from port, return to the at-sea setup.
The sequence prevents a category error. Ship Wi-Fi serves the vessel. Maritime cellular service is billed through a participating carrier. Roaming eSIM serves supported land networks in covered destinations. One product does not silently become another when the ship crosses the shoreline.
What each cruise line leaves a passenger to confirm
Carnival Cruise Line
Carnival publishes the most complete one-page explanation in the sample. A passenger can identify the network, understand that connection may occur automatically, see that the home carrier controls the bill, follow an airplane-mode prevention step, understand the port transition and read examples of passive activity.
The remaining work is carrier-specific. Carnival cannot say whether a given AT&T, Verizon, T-Mobile or international plan applies a pass, a per-use rate or no service. The passenger still needs the home carrier's current terms for the exact line and ship.
Royal Caribbean
Royal Caribbean's reviewed FAQ identifies onboard cellular service and tells passengers to contact the home carrier about rates. Separate first-party preparation guidance covers airplane mode. The checked source set does not directly explain automatic connection, a port boundary or passive use.
The practical follow-up is to ask when the ship's cellular service becomes available and what network name will appear. The carrier must answer whether calls, texts, voicemail or background data can create a charge.
Norwegian Cruise Line
Norwegian publishes five of six fields across three current FAQs. The pages identify Cellular at Sea, explain how a device connects, assign billing to the carrier, publish a service boundary and show an airplane-mode path for onboard app access.
The passive-use field remains unanswered under the method. A passenger should not turn that missing explanation into an assumption that an idle phone cannot use service.
MSC Cruises
MSC's FAQ is unusually direct about maritime roaming, home-carrier billing, airplane mode and the distance from shore. It also explains that the service becomes available automatically when the ship is at sea.
The reviewed FAQ does not give a direct passive-use explanation. A passenger should ask the carrier about background data, incoming activity and voicemail instead of relying on a general international-plan description.
Princess Cruises
Princess identifies maritime service and home-carrier billing in its onboard FAQ. Its current cruise-mistakes article supplies the airplane-mode guidance. Reviewing both pages prevents the study from incorrectly recording the prevention step as missing.
The checked pages do not directly state automatic connection, a port boundary or passive-use behavior. Those are the three questions to take to Princess and the home carrier before sailing.
Celebrity Cruises
Celebrity is the second line in the sample to explain passive-looking activity. Its five points come from several current first-party pages rather than one consolidated FAQ. The set covers automatic activation, carrier billing, airplane mode and passive use as well as network identification.
The missing field is a direct port or shore boundary. Passengers should wait for a supported terrestrial network rather than using the ship's physical position as the only signal.
Holland America Line
Holland America publishes onboard mobile-service guidance and a communication-at-sea document. Together they cover the network, automatic activation, carrier billing, airplane mode and a boundary.
The checked pages do not explain passive activity directly enough for a point. Travelers should ask the carrier how the exact plan treats an idle registered phone, incoming calls and voicemail.
Disney Cruise Line
Disney's guest-service page and Navigator app guidance cover five fields. They separate cellular service from the guest Wi-Fi path and provide a clear airplane-mode setup for using the app onboard.
The source set does not directly explain passive-use risk. A passenger who uses DCL-GUEST should still verify that the cellular line remains off and should ask the home carrier about any deliberate maritime use.
Cunard
Cunard's staying-connected and FAQ pages cover network identification, automatic availability, carrier billing, airplane-mode prevention and a shore boundary. The source set gives a passenger a useful connection outline.
The passive-use question remains with the home carrier. The passenger needs an answer that distinguishes background data, calls, texts and voicemail instead of one general roaming statement.
Oceania Cruises
Oceania identifies Cellular at Sea, directs passengers to their home carrier for rates and publishes that service becomes available around six nautical miles from shore. Those details make the source useful for timing and billing responsibility.
The reviewed pages do not explicitly publish automatic connection, airplane-mode prevention or passive-use examples. The safest preparation is to get those answers before departure and configure the phone before the published boundary is reached.
Ten questions cruise passengers ask about maritime roaming
The questions below were collected from public Reddit discussions found in indexed web results on August 22, 2026. The discussions establish demand and show where travelers remain confused. They are not used as proof of cruise-line or carrier policy. The answers below rely on the first-party source panel and keep carrier-specific billing questions with the carrier.
When should airplane mode be turned on?
Turn airplane mode on before the ship leaves terrestrial coverage and before the onboard maritime service becomes available. Seven lines publish a boundary, but the wording varies. A passenger does not need to wait for the last bar of shore signal to disappear. Configure the phone before departure and verify the cellular indicator afterward.
Is disabling data roaming enough?
Not for every risk. The data-roaming switch controls roaming data behavior, but it does not necessarily disable the cellular radio, calls, texts or registration. Nine of the ten cruise-line source sets publish airplane-mode or cellular-off guidance. Use that as the starting point unless deliberate maritime service requires a different setup.
Can a phone connect automatically when it is not being used?
Seven cruise lines explicitly publish automatic activation or connection behavior. Cellular at Sea also says compatible phones may connect automatically when its service is available. A dark screen does not prove that the phone is disconnected. Check the radio state and displayed network name.
Can background data, calls, texts or voicemail create charges?
They can create network activity, but the exact billing result belongs to the home carrier and plan. Only Carnival and Celebrity explain passive-looking activity clearly enough for a point in this study. Every passenger should ask the carrier which events activate a cruise pass or per-use charge.
Can ship Wi-Fi be used while airplane mode stays on?
Yes on common phones: enable airplane mode first, then turn Wi-Fi back on. Follow the selected cruise line's app and Wi-Fi instructions. The passenger should verify that cellular service remains off after Wi-Fi is restored.
Does connecting to ship Wi-Fi disable maritime cellular service?
No. Wi-Fi and cellular radios can be active at the same time. Joining a ship network does not prove that the phone stopped registering on Cellular at Sea or another maritime network. Airplane mode plus Wi-Fi is the clearer separation.
Does an ordinary international roaming plan cover Cellular at Sea?
Do not assume it does. Maritime networks can have separate eligibility, rates, ship lists and pass rules. Ask the carrier about the exact ship or maritime provider. A plan that covers a country on land does not automatically cover the water outside that country.
Does a travel eSIM work while the ship is at sea?
An ordinary country or regional Roaming eSIM plan uses supported terrestrial networks and is intended for covered ports and land travel. It is not general offshore coverage. A product must explicitly list a maritime network or ship before it can be evaluated as an at-sea option.
What network name identifies maritime service?
The displayed name can vary. First-party pages and provider guidance may show names such as Cellular at Sea or another maritime identifier. Check the selected line's current page and the phone's status bar. Do not treat an unfamiliar network near port as a supported terrestrial partner without verification.
How should several family phones be configured?
Set up every phone and every line separately. Confirm airplane mode, Wi-Fi, data roaming, cellular-data selection and data switching on each device. Ask the carrier whether different lines on the same account have different cruise-pass eligibility or controls. One correctly configured phone does not protect the others.
Other cruise-phone resources and their scope
These resources answer different parts of the cruise-phone problem. Check the scope before applying one carrier's or cruise line's guidance to another trip.
| Reviewed page | Useful coverage | Remaining gap |
|---|---|---|
| Carnival cellular phone service | The most complete single-line explanation in the sample | No comparison with other lines |
| Cellular at Sea service page | Network operation, identifiers and availability | Provider perspective rather than cruise-line disclosure accountability |
| Cellular at Sea FAQ | Automatic connection, billing and passive-use examples | No cruise-line matrix |
| Travel + Leisure airplane-mode article | Clear consumer explanation of airplane mode and background use | No stated sample, scoring rule or downloadable evidence |
| AT&T Cruise Day Pass | Current plan triggers, pricing and eligible use for AT&T | One carrier and eligible customers only |
| Oceania mobile phone FAQ | Network identification and carrier billing | No airplane-mode or passive-use explanation in the reviewed set |
| Cruise Critic cell phone guide | Broad comparison of ship Wi-Fi, cellular service and eSIMs | No reproducible line-by-line disclosure dataset |
| Princess onboard FAQ | Maritime service and carrier billing | Key prevention guidance sits on another page |
| MSC FAQ | Detailed maritime roaming, billing and airplane-mode guidance | No passive-use explanation |
| Kiplinger cruise phone guide | Accessible advice on connection and background-data risk | No fixed cruise-line sample, scoring rubric or reusable data |
The disclosure matrix uses six consistent fields and records missing answers instead of filling them with assumptions. The normalized records are available in CSV and JSON.
Study method
Research question
What do ten cruise lines explicitly tell passengers about maritime cellular service, automatic connection, home-carrier billing, airplane-mode prevention, port boundaries and passive phone activity?
The study measures public disclosure. It does not ask which cruise line has the lowest roaming charge because the home carrier sets the rate. It does not ask which ship has the best signal because no network test was performed.
Cruise-line sample
The fixed purposive sample contains Carnival Cruise Line, Royal Caribbean, Norwegian Cruise Line, MSC Cruises, Princess Cruises, Celebrity Cruises, Holland America Line, Disney Cruise Line, Cunard and Oceania Cruises.
The lines were selected to represent widely searched ocean-cruise brands marketed to United States and international travelers. The sample is not a market-share table, passenger-volume ranking or census of every cruise line. A reproducible study can use a purposive sample as long as the selection is published and the result is not generalized beyond it.
Source-search protocol
For each line, the research process reviewed current English-language first-party help, FAQ, passenger-guidance and editorial pages available without an account. A consistent official-domain search was used to find pages relevant to cellular service, maritime roaming, airplane mode, phone use, Wi-Fi and port transitions.
When one first-party page referred to a related preparation guide or PDF, that source was added to the line's source set. This mattered for Royal Caribbean, Princess and Celebrity because relevant guidance was split across pages.
The final panel contains 22 first-party URLs. Every URL and evidence note is preserved in the source JSON and normalized output. Sources were checked on August 22, 2026.
How the six maritime disclosure fields are defined
- Maritime network named: the source identifies the onboard cellular service or publishes a network name, provider name or maritime-roaming label that helps a passenger recognize it.
- Automatic activation published: the source says the phone may connect automatically, register when service becomes available or otherwise use the network without manual selection.
- Home-carrier billing published: the source says the passenger's mobile carrier sets, applies or bills the rate, or instructs the passenger to check that carrier's terms.
- Airplane-mode avoidance published: the source explicitly recommends airplane mode or turning cellular service off to avoid maritime use or charges.
- Port or shore boundary published: the source explains activation or deactivation in relation to port, shore, territorial waters or a stated distance from land.
- Passive-use risk published: the source explicitly explains that an idle phone, background data, incoming calls, texts, voicemail or another passive-looking activity can create network use or a charge.
Scoring rule
Each field is binary. A line receives one point only when the reviewed first-party source set explicitly publishes the defined information. Related first-party pages can be combined for the same line. The maximum score is six.
No point is inferred from common network behavior, another cruise line's page, a maritime provider's general FAQ, a carrier page, a search snippet or a forum comment. A field remains Not published when the source set uses wording too general to answer the definition.
The score is not weighted. Passive-use disclosure may be more important to one passenger, while a clear port boundary may matter more to another. The explorer therefore shows the six individual fields rather than only a total.
How to reproduce or update the study
- Keep the same ten-line sample and six field definitions.
- Open every first-party URL stored for each line.
- Run the same official-domain searches for newly published guidance.
- Record a point only for an explicit statement that meets the field definition.
- Preserve a missing answer as Not published instead of filling it with an assumption.
- Save the source URL, evidence note and check date.
- Run
node scripts/research/generate-cellular-at-sea-disclosure-index.mjs. - Compare the regenerated CSV, JSON, checksums and chart totals with the prior snapshot.
The generator calculates all six headline counts from the ten normalized records. It also computes the documentation leader, source-file checksum and row checksum. Manual edits to the generated totals would be overwritten.
Demand and competitor evidence
Ten public Reddit discussions were used to identify recurring traveler questions. They cover airplane-mode timing, the limits of the data-roaming switch, automatic connection, background activity, ship Wi-Fi, carrier-pass coverage, travel eSIM scope, network names and family setup. Reddit supplies demand evidence only.
Limitations
This study does not test real bills. A documentation point cannot prove that a carrier will charge, waive or cover a particular event. A missing point cannot prove that a behavior is absent.
The sample contains ten cruise lines and should not be generalized to every operator, ferry, river cruise or expedition vessel. A line may also provide additional guidance inside a booking account, cruise contract, email, app or cabin material that was not available in the public source set.
Pages can change after the snapshot. Network providers, ship installations, home-carrier partnerships and cruise passes can also change. The dated dataset remains reproducible because it preserves the rule, source set and check date. It should not replace a current check for a booked sailing.
The six fields are disclosure fields, not equally sized risks. A short automatic-connection statement earns one point, just as a detailed passive-use explanation earns one point. The individual columns are more informative than the total when planning a trip.
The Roaming eSIM catalog snapshot describes supported terrestrial plans for covered ports. It does not establish signal at a specific terminal or berth, does not include general offshore service and does not change the home carrier's voice, SMS, voicemail or Wi-Fi Calling terms.
How to cite this Cellular at Sea dataset or report a correction
Suggested citation: Roaming eSIM research team. "Cellular at Sea Disclosure Index: What 10 Cruise Lines Tell Passengers About Roaming Charges." August 22, 2026. Include the page URL and snapshot date.
The normalized CSV and JSON dataset are available under the Creative Commons Attribution 4.0 International license. You may copy, redistribute or adapt the data with attribution to Roaming eSIM and a link to this study. The cruise-line pages and other source material remain subject to their owners' terms.
If a cruise line publishes a clearer current page, send the first-party URL to Roaming eSIM support. We will preserve the snapshot date, document material corrections and regenerate the dataset when the evidence changes.
For the separate cost of internet access on an ocean voyage, read the Cruise Wi-Fi Price Index. For shorter European sailings, the European Ferry Wi-Fi Price Index compares free access, paid prices and package limits on ten ferry operators. Before installing a port-data plan, read when to install Roaming eSIM before travel and confirm that the selected plan covers every destination on the itinerary.
