Yes, you can text on a Carnival cruise, but the method depends on how much you are willing to pay. The most popular option is the Carnival HUB App's Chat Feature, which costs a flat fee of $5 USD (or approximately $8 AUD on some itineraries) for the entire duration of the cruise. This allows you to text other passengers on the ship who also have the feature activated. However, this is internal-only and does not work for people back home. If you want to use standard texting apps like iMessage or WhatsApp to reach the outside world, you must purchase an onboard Wi-Fi plan. The "Social" or "Value" plans are typically required for this. Without a Wi-Fi plan, your phone will stay in Airplane Mode, and standard cellular SMS will not work unless you use the ship's expensive "Cellular at Sea" roaming, which can lead to hundreds of dollars in unexpected charges. The HUB app is the best way to coordinate with your group on board, though users frequently note that push notifications can be hit-or-miss depending on your phone's power-saving settings.