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While for Iridium only Telstra Australia offers GSM-roaming, most Globalstar providers have roaming agreements with local cellular operators, enabling the use of a cellular SIM card with a Globalstar handset and vice versa.

Despite (or because of) the limitations above, Globalstar's operational costs were significantly cheaper and can support somewhat higher data rates than Iridium. However, such cost differences later proved meaningless when both companies shed their multi-billion dollar debts through bankruptcy .

Globalstar is a low Earth orbit (LEO) satellite constellation for telephone and low-speed data communications, similar to (and competing with) the Iridium satellite system.

Globalstar differs from Iridium in several important ways:

Globalstar satellites are simple "bent pipe" repeaters; there is no inter-satellite linking. A network of ground gateway stations provides connectivity from the 40 satellites to the public switched telephone network ; users are assigned telephone numbers on the North American Numbering Plan in North America or the appropriate telephone numbering plan for the country that the overseas gateway is located in, except for Brazil, where the official globalstar country code (+8818) is used. Because there is no inter-satellite linking, a satellite must have a gateway station in view to provide service to any users it may see. Because there are no gateway stations to cover certain remote areas (such as oceans far from land), no service can be provided in those areas even though the satellites fly over them. Globalstar orbits have an inclination of 52 degrees, compared to the near-polar 86.4-degree orbits used by Iridium. Globalstar also does not cover polar areas due to the lower orbital inclination.

The Globalstar system uses the Qualcomm CDMA air interface; however, the Ericsson and Telit phones accept standard GSM SIM cards, while the Qualcomm GSP-1600/1700 phones do not have a simcard interface, but use CDMA / IS-41 based authentication. Therefore the Globalstar gateways need to support both the CDMA / IS-41 and the GSM standards, which, however not all gateways do. This results in the lack of coverage for GSM-authentication-standard based phones in the Eastern Asian and Caribbean region, as stated on the coverage map: