Thank you for your help El_condor, but the problem with this provider is this:
What country code does the sim have?
The sim uses an Estonian number....
Besides that they charge to receive calls in Brazil.
I'll continue to look for some Global SIM that offer US, HK, etc. phone number, but after some research and andy's suggestion I think it will be easier to find a SIP VoIP provider that can call UK mobiles very cheap and use it to forward to some of the Isle of Man's SIMs.
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I admit that I don't understand well the global roaming. But their boss has an interesting VoIP blog (Roam4free) that I read regularily. So I found the company.
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Take a look in this forum that will help you to completely understand it. It's the best I've found in the last days about this subject:
International GSM prepaid cards - PrePaidGSM.net Forum