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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
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.
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.
Most commercial voice and some data mobile satellite services are provided by systems operating in the L-band by Iridium, Inmarsat, Globalstar and Thuraya.The L-band spectrum allocated for MSS is between 1.5 and 2.5 GHz, with the upper portion often referred to as the S-band.
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GEO-Mobile Radio Interface (GEO stands for Geostationary Earth Orbit), better known as GMR, is an ETSI standard for satellite phones.The GMR standard is derived from the 3GPP-family terrestrial digital cellular standards and supports access to GSM/UMTS core networks.
MMSS Inmarsat-3 satellite locations. Maritime mobile-satellite service (MMSS, or maritime mobile-satellite radiocommunication service) is – according to Article 1.29 of the International Telecommunication Union's Radio Regulations (RR) [1] – "A mobile-satellite service in which mobile earth stations are located on board ships; survival craft stations and emergency position-indicating ...