Iridium 9602/9603/9523 autentification question

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Joined Aug 21, 2017
Bit read today about Iridium SBD modules where all places are said it are pin-card-less, demands no any form of autentification. However how then they know where to send a bill for 6 cents per each 340 bits "telegram"?? Some kind of MAC-adress system?? Then how they may be sure one is not shifting MAC-address so long while find a well paid channel where sit long and happy until become arrested? By the way, just today was nice article explaining how Ilon Musk "space train" allows to identify one`s RECEIVER position even if he avoid to radiate any signal out. But anyway, do someone have knowledge how the Iridium pay system is organized for all RockBLOCKs etc?

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