Technically very easy - a Thuraya handset has a built-in GPS. Your position is transmitted to the service provider as part of your registration when you switch your phone on (that's also how the phone displays your current country). The provider can then decide whether to allow a call based on your country of location.
I don't know about other restricted countries, but Iraq and Afganistan have special rates.
Last edited by MovingHouse; 6 Feb 2011 at 16:43.
Reason: grammar
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