United-Mobile on Cruise ship

[Bossman]

I agree.

If anything, the prepaid sims such as UM+, yackie, etc. will charge the rates quoted for the home of the network provider. So, for example WMS which provides the network for a lot of ships including the one I was on, RCCL, is US based. So, maybe that's why UM+ charged US rates. If you really want to find out, you may well just ask your sim card provider.

I could have tested it out when I go on my next cruise to the caribbean in March. However, the cruise line I will be going on (princess), just signed an agreement at ehe beginning of the year with a Norway based company MCP, to install the network on their ships. So, it will be very unlikely that it's done before then. Being a Norway based company, one would think the Norway rates will be charge by the prepaid sims...but you never know.

Originally Posted by MrEd

Port/country of registry will have no relevance to what GSM network is on the vessel.