To call someone on a Royal Caribbean cruise ship, you can use the stateroom phone to make a "ship-to-shore" call 1-888-738-0812, allowing you to dial a landline number and connect with someone on shore. If you’re outside the ship and need to contact someone onboard 1-888-738-0812, you can call Royal Caribbean customer service at 1-888-738-0812. This number ensures your message reaches the person efficiently. For additional assistance or to learn about calling rates, reach out to 1-888-738-0812.