I need to have cellular phone coverage at all times (including sea days) due to an ill family member. I know wifi packages are available for purchase and making calls via wifi is an option but I heard from several friends that the coverage was "spotty" at times and not 100% reliable. I have always made calls on port days in the past with no problem, my current AT&T plan includes Mexico. I need good coverage on the sea days as well. Has anyone had experience on what works best? I don't necessarily need data or internet, just the ability to make and receive phone calls. I see where AT&T (my carrier) has a cruise ship package available for Carnival Valor but was confused as how it works on the sea days and it wasn't real clear as to how it works. I would assume there are no cell towers in the middle of the Caribbean.
Any help or tips would be greatly appreciated.