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The Global Mobile Satellite System (GMSS) consists of several satellite phone providers serving private customers. It can be compared to PLMN (wireless telephony carriers) and PSTN (traditional wire-based telephony). As of 2023, ranges of numbers have been assigned to two GMSS carriers: Iridium Satellite LLC; Globalstar
As in the other such shared country codes, carriers are allocated number space within this code space plus their identification code (two-digit number in 882 code space, three or four digit number in 883 code space). The phone number for a subscriber of such a service starts with +882/+883 followed by the carrier code.
Country calling codes, country dial-in codes, international subscriber dialing ... Global Mobile Satellite System (GMSS) 881: Globalstar (Mobile Satellite Service)
Globalstar, although allocated +881 8 and +881 9 use U.S. telephone numbers except for service resellers located in Brazil, which use the +881 range. Small regional satellite phone networks are allocated numbers in the +882 code designated for " international networks " which is not used exclusively for satellite phone networks.
Telephone calls to satellite terminals are often accomplished by dialing numbers assigned to the Global Mobile Satellite System, although most Globalstar users and some Iridium users are assigned country-based numbers. Thus, calls can be made to satellite phones from normal land-line and cellular terminals.
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Every SIM card contains a secret key, called the Ki, which is used to provide authentication and encryption services. This is useful to prevent theft of service, and also to prevent "over the air" snooping of a user's activity. The network does this by utilising the Authentication Center and is accomplished without transmitting the key directly.