Cruise Connectivity Terms, Defined

Using your phone on a cellular network at sea, billed by your home carrier under its roaming terms, the same arrangement as roaming in a foreign country. The network happens to be on a ship instead of in a country. “At sea” means you are in international waters; in cellular roaming terms, it is like being in a country.

The compact cellular network a cruise ship carries on board, doing the job a cell tower does on land, for everyone on the ship. Cellular at Sea operates shipboard networks aboard 210+ cruise ships.

The satellite link that connects a ship’s onboard network to the ground, carrying calls, texts, and data between the ship and your carrier’s network.

The mobile country code specifically identifying Cellular at Sea as an international network.

Cellular at Sea’s mobile country code (901) and mobile network code (18) pair, uniquely identifying Wireless Maritime Services (WMS) among all international cellular operators. Full explanation on the 901 page.

A flat-rate daily service some carriers offer for phone use at sea and sometimes on land, designed to make onboard usage a known daily price. Offered and priced by each carrier; check yours before sailing.

Roaming charges billed per minute, message, and megabyte under your plan’s standard rates when no package applies. Disclosed in your carrier’s roaming terms.

The phone setting that allows mobile data on networks other than your home carrier’s. Off means no data usage while traveling; on means data flows under your plan’s roaming terms.

Ocean beyond any country’s territorial waters. Relevant here because it’s where land networks are out of reach and shipboard networks operate. Typically about an hour after a cruise ship leaves port.

The onboard internet service offered by the cruise line, separate from cellular service; cellular service also provides internet as well as voice calling. Wi-Fi provides internet on devices connected to it; cellular service mobile data enables internet too, but also provides your phone number, and allows for calls, texts, secure mobile banking, and two-factor authentication. Both exist on board; see your connectivity options on a cruise. Generally, cellular is ideal for all applications except streaming, large file uploads, or heavy web surfing or social media.

A digital SIM built into modern phones that can enable additional mobile plans without a physical card. In a cruise context, some travelers add an eSIM with cruise coverage alongside their regular line. This is typical if their home cellular carrier does not provide data services, enabling internet, on cruise ships. The Cellular at Sea Cruise+ eSIM, OneRoam, provides seamless coverage from ship to land to ship.

The behind-the-scenes arrangement between your home cellular carrier and another network, that lets your phone use that network, while your carrier bills you for it. Cellular at Sea maintains roaming agreements with 400+ carriers globally.