Thuraya
 

Check out Roaming Partners of Thuraya on their homepage (www.thuraya.com). All SIMs
of the listed partners will work on Thuraya Network (postpaid for sure, for prepaid cards you have to consult with your telco, in most cases they will activate it for roaming if you provide a credit card for debit).
I used "Thuraya Roaming" quite often, in Austria the roaming fees are similar to the prepaid price plan of Thuraya, therefore in most cases the better choice than Thuraya SIM....
PS.
In nearly all cases the SIM card will work, I am using a SIM which was initially activated 1997 ...