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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.
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.
Inmarsat: 870: SNAC (Single Network Access Code) ICO Global: 881 0, 881 1; Ellipso: 881 2, 881 3; Iridium: 881 6, 881 7; Globalstar: 881 8, 881 9; Emsat: 882 13; Thuraya: 882 16; ACeS: 882 20; Some satellite telephones are issued with telephone numbers from a national numbering plan; for example, Globalstar issues NANP telephone numbers.
The phone number for a subscriber of such a service starts with +882/+883 followed by the carrier code. The cost to call such a number can be high; for example in the British Telecom price list rates for various 882 and 883 numbers ranged from £0.60 to £4.50 per minute.
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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.