Common Cruise eSIM Mistakes to Avoid

Cruise eSIMs make it easier to stay connected at sea and in port, but a few setup mistakes can lead to no service, unexpected charges, or wasted data.

By configuring your eSIM before boarding and checking your roaming and Dual SIM settings, you can avoid common problems.

Here are the key cruise eSIM mistakes to avoid, and what to do instead.

Quick Answer: What Are the Most Common Cruise eSIM Mistakes?

The most common cruise eSIM mistakes include buying an eSIM without maritime coverage, not checking phone or cruise compatibility, activating the plan too early, and using the wrong SIM settings.

Before sailing, install your eSIM, select it for mobile data, turn off data roaming on your regular SIM, and disable automatic data switching. Also check when your plan activates and whether it covers both at-sea and in-port connectivity.

Common Cruise eSIM Mistakes to Avoid

Here are some of the most common mistakes travelers make when buying and using a cruise eSIM.

1. Buying a Cruise eSIM Without Checking eSIM Phone Compatibility

One of the easiest mistakes to avoid is buying a cruise eSIM before checking whether your phone can actually use it.

Not every smartphone supports eSIM, and support can sometimes vary depending on the phone model, country where it was purchased, or mobile carrier.

Cruise eSIMs use the same built-in eSIM technology as regular travel eSIMs. This means your phone needs to be eSIM-compatible before you can install and use a cruise eSIM.

Before buying a plan, check:

• Whether your phone supports eSIM. Most newer iPhones, Google Pixel phones, and many Samsung Galaxy models support eSIM, but older devices may not.

• Whether your phone is carrier unlocked. A carrier-locked phone may prevent you from installing or using an eSIM from another provider.

• Whether your specific model supports eSIM. Some phones have different versions for different markets, and eSIM functionality may be unavailable or disabled on certain regional models.

Which phones support eSIM? For a full compatibility list and instructions for checking your device, see Which Phones Support eSIM for Cruise?

2. Buying a Regular Travel eSIM When You Need Internet at Sea

One of the biggest mistakes cruise travelers can make is assuming that any travel eSIM will work while the ship is at sea. Regular travel eSIMs and cruise eSIMs may use the same eSIM technology, but the networks and coverage included in their plans can be very different.

A standard international, regional, or country-specific travel eSIM typically connects to terrestrial mobile networks. These are the same land-based cellular networks used by local mobile carriers. This makes a regular travel eSIM a good option while you're exploring a port or traveling on land before or after your cruise.

However, once the ship sails far enough away from the coast, it may move beyond the range of terrestrial cell towers. At that point, a regular travel eSIM may lose service and remain disconnected until the ship gets close enough to land again.

If you want mobile data while sailing at sea, look for a cruise eSIM that specifically includes maritime coverage. A cruise eSIM can connect to supported maritime networks while the ship is offshore, allowing you to use mobile data even when land-based networks aren't available.

The main difference is:

• Travel eSIM: Primarily provides mobile data in ports and on land through terrestrial cellular networks.

• Cruise eSIM: Can provide maritime connectivity while at sea and may also include land-based coverage in supported countries and ports.

Coverage still varies between plans. A cruise eSIM doesn't automatically work on every ship, route, or destination, so always check the plan's supported ships, maritime coverage, and land coverage before purchasing.

If you only need internet when the ship is in port, a regular travel eSIM may be enough. But if staying connected between ports is important, choose a plan that specifically includes at-sea maritime coverage.

Read more: Cruise eSIM vs Travel eSIM vs Physical SIM for Cruise Travel

3. Not Checking Cruise Ship and Itinerary Coverage

Buying a cruise eSIM doesn't automatically mean it will work on every cruise line, ship, or itinerary.

Coverage varies between eSIM plans, so it's important to check where your plan works before purchasing.

Check whether the plan supports:

• Your cruise line and specific ship

• The countries and ports on your itinerary

• Maritime coverage while sailing at sea

• Land-based coverage while you're in port

At-sea and in-port coverage can be different. A plan may provide maritime connectivity on your ship but only support certain countries when you're on land, or vice versa.

This is especially important on multi-country cruises, where you'll want to make sure the plan covers as much of your itinerary as possible.

4. Waiting Until You're on the Ship to Install Your eSIM

Another common mistake is waiting until you're already onboard to install your cruise eSIM.

eSIM installation normally requires an internet connection, so it's much easier to complete the setup at home using reliable Wi-Fi.

If you wait until embarkation day, you may have to rely on cruise terminal Wi-Fi, ship Wi-Fi, or another public connection. This can make the installation process less convenient, especially when you're also checking in, boarding, and getting settled on the ship.

Whenever possible, buy and install your cruise eSIM before leaving home. This also gives you time to make sure the eSIM appears correctly in your phone's settings and resolve any installation problems before your cruise begins.

Just remember that installing an eSIM doesn't always mean activating the plan. More on this below.

For more details, see When to Buy Your Cruise eSIM (Before vs. on Arrival).

5. Activating Your Cruise eSIM Too Early

Another common mistake is activating your cruise eSIM too early and accidentally using part of the plan's validity period before your cruise even begins.

It's important to understand that buying, installing, activating, and connecting an eSIM are not always the same thing:

Buy → Install → Activate → Connect

You might buy and install your eSIM several days before departure, but the plan may not activate until it connects to a supported network. However, activation rules vary between providers. Some plans start when you install the eSIM, some when you manually activate it, some after purchase, and others only after the first successful network connection.

This is especially important if your cruise eSIM also includes land coverage in your current location. If the plan activates when it first connects to a supported network, leaving the eSIM turned on could allow it to connect before your cruise and start the validity period early.

Before installing or enabling your eSIM, check exactly when your provider says the plan starts. If the plan activates on first connection, it's usually best to install it in advance but keep the eSIM turned off until the day of departure.

For more information, see When to Buy Your Cruise eSIM (Before vs. on Arrival) and How to Activate Your Cruise eSIM Before Boarding.

6. Leaving Data Roaming On for Your Regular SIM

If you're using your regular SIM and cruise eSIM together, one of the most important settings to check before sailing is data roaming on your regular SIM.

Many Dual SIM phones allow you to keep your regular SIM active for calls and SMS while using your cruise eSIM for mobile data. This can be useful if you want to keep your normal phone number available for incoming calls, text messages, or verification codes during your trip.

However, data roaming should normally be turned off for your regular SIM. If it remains enabled, your phone could use your home carrier's roaming service when you're abroad. In port, this could mean international roaming charges, while at sea, connecting through a maritime cellular network can result in particularly expensive data charges.

The recommended setup is usually:

• Regular SIM: Keep enabled for calls and SMS, but turn Data Roaming OFF.

• Cruise eSIM: Select as your mobile data line and turn Data Roaming ON if your eSIM provider requires it.

Turning data roaming off doesn't mean you have to disable your regular SIM completely. Your regular number can remain active and may still receive calls and SMS when connected to a supported network.

Keep in mind, however, that calls and SMS can still incur roaming charges. Receiving or making calls at sea can be especially expensive depending on your mobile carrier and the maritime network. Incoming SMS may be free with some carriers, but this varies by plan.

For more detailed setup instructions, see How to Use Your Regular SIM and Cruise eSIM Together and Can I Use My Regular SIM and Cruise eSIM at the Same Time?

7. Forgetting to Turn Data Roaming On for the Cruise eSIM

While data roaming should normally be off on your regular SIM, the opposite may be true for your cruise eSIM.

Many travel and cruise eSIMs require Data Roaming to be turned on for the eSIM line. This is because the eSIM may connect through partner networks rather than a network operated directly by the eSIM provider.

If data roaming is turned off, you might install and activate your cruise eSIM correctly and even see it listed in your phone's settings, but still be unable to connect to the internet.

The key is to make sure you're changing the roaming setting for the correct SIM. On a Dual SIM phone, each line can have its own settings, so turning roaming off for your regular SIM doesn't necessarily turn it off for your cruise eSIM.

However, not every eSIM works in exactly the same way. Always follow your cruise eSIM provider's instructions and only enable data roaming on the eSIM if the provider requires it.

Read more: eSIM Not Working? Here's How to Fix It

8. Leaving Automatic Mobile Data Switching Turned On

Another setting to check when using your regular SIM and cruise eSIM together is automatic mobile data switching.

Many Dual SIM phones can automatically switch mobile data from one SIM to another if the selected data connection becomes weak or unavailable. This can be convenient during everyday use, but on a cruise, it could cause your phone to use your regular SIM when you don't want it to.

For example:

Cruise eSIM loses connection → phone switches to regular SIM → regular SIM connects through roaming → unexpected charges

This could happen when your cruise eSIM temporarily loses coverage at sea or while the phone is switching between maritime and land-based networks.

To reduce this risk, disable automatic data switching before your cruise. Depending on your phone, the setting may be called:

• Allow Cellular Data Switching on iPhone

• Automatic Data Switching, Switch Mobile Data Automatically, or something similar on Android

You may also see this option while installing or setting up your eSIM. If your phone asks whether you want to allow mobile data switching between SIMs, choose No.

It's still a good idea to keep data roaming turned off on your regular SIM as an additional safeguard. That way, your cruise eSIM remains your designated line for mobile data while your regular SIM can stay active for calls and SMS.

9. Selecting the Wrong SIM for Mobile Data

Installing and enabling your cruise eSIM doesn't automatically mean your phone will use it for internet access. On a Dual SIM phone, you usually need to specify which SIM should be used for mobile data.

Before sailing, check your cellular or SIM settings and make sure your cruise eSIM is selected:

Mobile Data / Cellular Data → Cruise eSIM

If your regular SIM is still selected for mobile data, your phone may try to use your home carrier's international or maritime roaming instead. This could result in unexpected roaming charges, even though your cruise eSIM is installed and active.

This is particularly important if you're keeping both SIMs enabled so that your regular number remains available for calls and SMS.

For a typical cruise setup, use your cruise eSIM for mobile data and your regular SIM for calls and SMS. It's also a good idea to turn off data roaming on your regular SIM and disable automatic mobile data switching to prevent your phone from accidentally using it for internet access.

10. Assuming the eSIM Will Work Everywhere on the Cruise

Even if your cruise eSIM includes both maritime and land coverage, you shouldn't assume you'll have an uninterrupted connection throughout the entire trip.

Coverage can change as the ship moves between the open sea, coastal areas, and ports.

During a typical cruise, your phone may connect to different types of networks:

At sea → maritime network. When the ship is away from land, a cruise eSIM may connect to a supported maritime network if your plan and ship are covered.

Approaching land → terrestrial networks become available. As the ship gets closer to the coast, your phone may begin detecting land-based cellular networks. There may be a short period when the connection changes or becomes temporarily unavailable.

In port → local mobile network. Once you're in port, an eSIM with land coverage may connect to a local partner network, similar to a regular travel eSIM.

Because of these transitions, coverage and connection quality can vary throughout the cruise. It depends on factors such as your ship's location, the networks available in that area, your itinerary, and the specific coverage included with your eSIM plan.

Before buying, check whether your plan covers both at-sea and in-port use, as some cruise eSIMs may provide maritime coverage but not land coverage in every destinateion—or vice versa.

For more information about using your eSIM when the ship docks, see Will My eSIM Work When the Cruise Arrives in Port?

11. Using Airplane Mode Without Understanding What It Disables

Many cruise travelers are advised to turn on Airplane Mode to avoid accidental roaming charges. This is useful when you plan to rely entirely on the ship's Wi-Fi, but it can cause confusion if you're trying to use a cruise eSIM.

Airplane Mode normally disables your phone's cellular connection. That means your cruise eSIM won't be able to connect to a supported maritime or terrestrial mobile network while cellular connectivity is turned off.

The correct setup depends on how you want to get online:

• Using ship Wi-Fi: You can keep Airplane Mode on and manually turn Wi-Fi back on. Your phone can then connect to the ship's Wi-Fi without using cellular data.

• Using a cruise eSIM: Cellular connectivity needs to be available so the eSIM can connect to a supported network. Make sure the cruise eSIM is enabled and selected for mobile data.

If you're worried about your regular SIM connecting to an expensive roaming network, you don't necessarily need to rely on Airplane Mode. Instead, you can turn data roaming off for your regular SIM, select the cruise eSIM for mobile data, and disable automatic mobile data switching.

This allows your cruise eSIM to use cellular data while reducing the risk of your regular SIM accidentally using roaming data.

For more information about managing your cellular settings at sea, see:

• Does Airplane Mode Stop Cruise Charges?

• What Happens If You Leave Roaming On During a Cruise?

12. Using Too Much Data Without Realizing It

Even if you're not actively using your phone, it can continue consuming mobile data in the background.

On a cruise, this can cause your eSIM data allowance to run out much faster than expected.

Some of the biggest data users include:

• Video streaming on Netflix, YouTube, and other streaming services

• Instagram, TikTok, and Reels, especially when watching lots of videos

• Video calls through FaceTime, WhatsApp, Zoom, or similar apps

• Cloud photo and video backups

• Automatic app and system updates

• Automatic downloads of photos, videos, podcasts, and other files

• Hotspot use, especially when connecting laptops or other devices

Before your cruise, download movies, TV shows, playlists, podcasts, maps, books, and other large files using Wi-Fi. It's also a good idea to disable unnecessary background data, automatic updates, and cloud backups while using your cruise eSIM.

How much data you need depends on how you plan to use your phone. As a general guide:

If your plan has a limited data allowance, monitor your usage throughout the trip rather than waiting until you're almost out of data.

Read more:

• Cruise eSIM Data Plan Used Up Too Fast? How to Manage Your Data

• How to Buy an eSIM for Cruise (2026)

13. Assuming “No Service” Means the eSIM Is Broken

Seeing “No Service” after installing your cruise eSIM doesn't necessarily mean something is wrong with the eSIM or that it was installed incorrectly. In many cases, it simply means that a supported network isn't currently available.

This is particularly common with cruise eSIMs because network availability can change throughout the journey. For example, you might see No Service when:

• The ship is outside the eSIM plan's maritime coverage area.

• Your cruise ship or current location isn't supported by the plan.

• The ship is transitioning between a maritime network and terrestrial networks near the coast.

• You're in port, but your plan doesn't include land coverage in that country.

• A supported network hasn't become available yet.

You may also see No Service before your cruise begins. If you've installed a maritime eSIM at home, there may simply be no compatible network for it to connect to until you're onboard and within the plan's coverage area.

If your eSIM shows No Service, don't immediately delete or reinstall it. First, check your provider's coverage information and confirm that your current location or ship should be supported. If you're moving between sea and port coverage, give your phone some time to find and connect to the appropriate network.

If you're in a supported coverage area and the eSIM still won't connect, then check your settings, including whether the eSIM is enabled, selected for mobile data, and has Data Roaming turned on if required by your provider.

In short, No Service can be normal when no supported network is available. Troubleshoot the eSIM only if it continues after you've entered an area where your plan should provide coverage.

Read more: Common Reasons Why an eSIM Doesn't Work

14. Deleting the eSIM When It Isn't Working

If your cruise eSIM isn't connecting, don't delete it as your first troubleshooting step.

A connection problem doesn't necessarily mean there is anything wrong with the installed eSIM profile.

In fact, deleting the eSIM can make the problem more difficult to fix. Some eSIM installation QR codes are designed for one-time use, which means you may not be able to simply scan the same QR code and reinstall the eSIM after deleting it. You may need to contact the provider for help or receive a new installation code.

Before removing anything, check the most common causes of connection problems:

• Make sure the eSIM is enabled in your phone's SIM or cellular settings.

• Select the cruise eSIM for mobile data rather than your regular SIM.

• Check Data Roaming. Many cruise and travel eSIMs require it to be turned on for the eSIM line.

• Check Airplane Mode. Your eSIM can't connect to a cellular or maritime network if cellular connectivity is disabled.

• Check network availability. There may simply be no supported network available at your current location.

• Check the APN settings if your eSIM provider requires a specific APN configuration.

• Confirm your ship and location are covered by your plan. Coverage may differ at sea, near the coast, and in port.

If all of these settings are correct, try basic troubleshooting steps such as restarting your phone or briefly turning Airplane Mode on and off to force the device to search for available networks again.

Only delete the eSIM if your provider specifically instructs you to remove and reinstall it. If you're unsure, contact the provider first so you don't accidentally remove an eSIM that cannot be easily reinstalled.

For more troubleshooting steps, see: eSIM Not Working? Here's How to Fix It

Featured photo by Polina Zimmerman from Pexels