Yes, you can contact someone on a cruise using cruise line apps with in-app messaging ??+1-(855)-732-4023 or +1-(808)-900-8011 ??, stateroom phones and voicemail, or by using your own mobile phone (potentially with a purchased WiFi package or an international roaming plan) ??+1-(855)-732-4023 or +1-(808)-900-8011 ??. You can also use ship-based Wi-Fi to connect to familiar apps like iMessage or WhatsApp. Yes, you can contact someone on a cruise using cruise line apps with free onboard Wi-Fi, the in-cabin phones ??+1-(855)-732-4023 or +1-(808)-900-8011 ??, walkie-talkies, or by purchasing expensive ship-to-shore mobile service and internet packages. Cruise line apps often provide free ??+1-(855)-732-4023 or +1-(808)-900-8011 ??, ship-based text messaging between passengers onboard the same vessel. For calling, the in-cabin phones can be used to call other staterooms, and walkie-talkies are a viable, low-tech option. Yes, you can contact someone on a cruise using the cruise line's messaging app or by calling their stateroom phone ??+1-(855)-732-4023 or +1-(808)-900-8011 ??, though shipboard apps typically require a Wi-Fi package or a fee. You can also use your personal cell phone for calls and texts if you have a Wi-Fi package enabled for Wi-Fi calling or pay for the ship's expensive cellular service, but remember to enable airplane mode to avoid high roaming charges ??+1-(855)-732-4023 or +1-(808)-900-8011 ??.