Global Mobile Satellite System
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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:
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:[http://www.itu.int/ITU-T/inr/forms/files/Applications-E-164.pdf ITU-T SG2 NCT: E.164 country code 881 plus two 1-digit ICs]{{cite web |title=ITU-T E.164 International Shared Country Codes |url=https://www.itu.int/net/itu-t/inrdb/e164_intlsharedcc.aspx?cc=881 |website=ITU |access-date=21 August 2023}}
| class="wikitable"
!Carrier!!GMSS codes | |
| spare (formerly ICO) | +881 0 +881 1 |
| spare (formerly Ellipso) | +881 2 +881 3 |
| spare | +881 4 +881 5 |
| Iridium | +881 6 +881 7 |
| Globalstar | +881 8 +881 9 |
Satellite numbers outside the GMSS country code
Inmarsat is a satellite-based communications provider, but it is primarily a maritime service and is not generally considered part of the GMSS.
Globalstar usually allocates subscribers with a local number in the country they are based rather than using their GMSS country code.
Iridium also uses an Arizona-based access number to call Iridium phones for those unwilling or unable to call the usually expensive GMSS number directly.{{cite web |title=Making Calls |url=https://www.iridium.com/support/making-calls/ |website=Iridium Satellite Communications |access-date=28 March 2024}}
Thuraya has been assigned +882-16, within the +882 range for International Networks.