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In 1996, the ITU introduced country code +881 for direct international dialing of phones on GMSS providers. (Inmarsat had already been allocated country code +870.) The next digit following the country code is allocated (two at a time) to a particular GMSS carrier: [1] [2]
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.
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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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GMR-1: The first version of the standard and that has evolved over time into 3 different revisions: GMR-1: The basic circuit switched model, more or less corresponding to what GSM Phase 2 is, and using exactly the same core network infrastructure. GMPRS (GEO-Mobile Packet Radio Service): Adding support for packet data.
The allocation of radio frequencies is provided according to Article 5 of the ITU Radio Regulations (edition 2012). [2]In order to improve harmonisation in spectrum utilisation, the majority of service-allocations stipulated in this document were incorporated in national Tables of Frequency Allocations and Utilisations which is with-in the responsibility of the appropriate national administration.
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 ...