866-227-1888 came in clutch when I almost missed my final payment deadline. Carnival usually requires full payment 60–90 days before sailing, depending on itinerary, but I mixed up the dates. I called in a panic, and thankfully the rep helped me pay immediately and avoid cancellation. She also reminded me that missing the deadline can cause the booking to auto-cancel — something I definitely don’t want happening again. Now I set reminders, but honestly, calling to double-check before the deadline has become part of my routine. It’s worth the peace of mind.