Buy for the itinerary
A Canada-only plan is not enough for Alaska ports, and a U.S. plan may not cover Canadian embarkation days. Map the countries before choosing an eSIM.
Maritime networks are different
Cellular-at-sea services can appear when the ship is offshore. They may carry separate rates even when your land roaming is included.
Use Wi-Fi calling carefully
Wi-Fi calling behavior and billing depend on your carrier. Confirm how calls and texts are charged before relying on it.
Keep offline backups
Save boarding documents, excursion vouchers and maps locally so a failed data connection does not become a travel problem.
Turn the advice into a trip plan
Write down the decision that affects your booking or port day, the deadline for making it, and the information that could still change. Cruise planning gets easier when permanent preferences are separated from live operational details.