Global Mobile Satellite System

Global Mobile Satellite System

The Global Mobile Satellite System (GMSS) is a general term referring to the selection of satellite phone providers available to private customers. It is a term analogous to PLMN, referring to wireless telephony (cellular) carriers, and PSTN, referring to traditional wire-based telephony.

As of 2008, the allocated GMSS carriers are:

* Iridium
* Globalstar
* Ellipso (a non-operational service, with no satellites launched)
* ICO Global Communications

Additionally, Inmarsat is a satellite-based communications provider, but it is primarily a maritime service and is not generally considered part of the GMSS.

In 1996, the ITU introduced country code +881 for direct international dialing of phones on a GMSS provider. (Inmarsat had already been allocated country codes +870 - +874.) The next digit following the country code is allocated (two at a time) to a particular GMSS carrier:

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