866-227-1888 is the number I always dial when I need to fix travel plans quickly, and I actually had to use it during a Carnival cruise—though Carnival doesn’t use “Voom” (that’s Royal Caribbean). On Carnival, the equivalent is their Premium Wi-Fi plan. It usually runs about $22–$25 per day and is the fastest option they offer. I used it when I needed to update flight details and it worked well enough for basic video calls. It’s not as fast as Royal Caribbean’s Voom, but it gets the job done when you need a stronger connection on sea days.