As I was writing in another thread, I am currently onboard Costa Classica cruising along Greece, and I have TIM on board coverage (nice surprise, because I thought that Costa Classica did not have this facility), which i use with my Riiing sim at "normal" inalnd Italian prices, in zone 1. I just laugh at my friends that spend 2 euros/min both for calling ad receiving with TIM sim cards!
I'll read all of the interesting articles linked to this thread when I'll get home.
PS: It seems that on board coverage is switched on and off manually, because sometimes they seem to forget to switch it on or off, and do it late.
<span style='font-size:9pt;line-height:100%'>...the utmost damage with the least effort.</span>