Communicating with your travel party on a cruise ship in 2026 is primarily done through the official cruise line mobile app. Major lines like Royal Caribbean, Disney, and Carnival offer a "Guest-to-Guest Chat" feature that works over the ship's internal Wi-Fi without requiring you to purchase an expensive external internet package. On Royal Caribbean, this feature is now free for all guests, while other lines may still charge a small one-time fee (around $5) for the duration of the sailing. For those who do purchase a full Wi-Fi package (like Starlink-powered "Voom" or "MedallionNet"), standard apps like WhatsApp and iMessage work seamlessly. For families with children who don't have phones, "old-school" methods are still popular: using the cabin's landline to leave voicemails, writing on magnetic whiteboards attached to the stateroom door, or setting "rally points" at specific times. While some use walkie-talkies, they often struggle with the ship's thick steel walls and can be disruptive to other guests, making digital app-based communication the preferred and most reliable method for 2026 travelers.