Cingular Maritime and United Mobile?

[AndreA]

Originally Posted by Przemolog

However, there were reports that UM roams on TIM GSM-on-Ships service at the same rate as on Italian land. This doesn't have to be true for other services of that type, however. I suppose that since there are no speficified rates for using UM with
GSM-on-Ships roamings, then either they are charged at "land rates" of the service providers or the roaming isn't available at all. Of course, there also may be an "undefined tariff status" as in case of UM roaming in Japan.

Well, I had the usual tariff plan (free incoming calls ) with my UM simcard on SuperFast Ferries too (ISIMINN, Iceland maritime network). Now I'm curious to know their billing on other gsm maritime networks

[AndreA]

Well, maybe I solved the mystery

I was looking aboute maritime services and their network. If you check the list of MCC (Mobile Country Code) you can note that only few maritime networks are using a Satellite code (MCC 901):

Inmarsat Ltd.	901 11
Maritime Communications Partner AS (link)	901 12
Global Networks, Inc.	901 13
Telenor	901 14
Jersey Telecom (link)	901 17
Cingular Wireless (link)	901 18
Vodafone Malta Maritime	901 19

Other networks as Isiminn or Tim on board also are using the usual national codes and so United Mobile (and others) can't know the different way of system using the usual tariffation plan. So if you roam on Tim or Isiminn maybe you'll have your usual roaming charges, but when you roam on the code 901 (it's a satellite code, pay attention!) you'll have the extrasurchage. What do you think? Am I wronging?