Iridium 9602/9603/9523 autentification question

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Janis59

Joined Aug 21, 2017
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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?
a) https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=&ved=2ahUKEwj2roK2xrXzAhUGzIsKHQHgBQUQFnoECCgQAQ&url=https://geoborders.com/include/download.php?id=1185&usg=AOvVaw0vSZdF9P1I1oqNrgWr7LoM

b) https://www.scribd.com/document/234405656/Iridium-9603-Developer-s-Kit-v1-0
 
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