The Iridium PTT service has been used by the military for years, but is now cleared for civilian use. Today anyone can stay connected with other PTT phones anywhere on the planet at the touch of a button.  Since PTT functionality is built into Iridium Extreme Phones, they can also be used as a standard satellite telephones.

iridium coverage chart

The Iridium system is a satellite-based, wireless personal communications network providing a robust suite of voice and data features all over the globe. It is comprised of three principal components — the satellite network, the ground network and the Iridium subscriber products, including phones and data modems.

The design of the Iridium network allows voice and data messages to be routed anywhere in the world. Voice and data calls are relayed from one satellite to another until they reach the satellite above the Iridium handset or terminal and the signal is relayed back to Earth. When an Iridium customer places a call from a handset or terminal, it connects to whatever satellite happens to be overhead, and is relayed among satellites around the globe to whatever satellite is above the appropriate Earth gateway, which downlinks the call and transfers it to the global public voice network or Internet so that it reaches the recipient.


Galaxy 18 is a Space Systems/Loral (SS/L) 1300-series hybrid Make and receive phone calls anywhere in the world (including the polar regions), with free inbound SMS messaging from any computer. Iridium’s location based services enable users to send Google map position reports on-demand, with additional free emergency 911 base calling.
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Iridium Go!

The first satellite hotspot of its kind which incorporates iPhones, iPad, and Android wireless connections for true app connectivity. The Iridium Go! enables users to have all their contacts, emails, and other data at their fingertips while being connected to the Iridium Satellite Network.
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Push-To-Talk Radio Over Satellite services is available on the Dual-Mode 9575 Extreme PTT handset, with a simplified and easy User Interface for efficient and cost effective Talk Group management. New rate plans with no talk group fees, for North American users.
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PTT Talkgroups

A Talkgroup describes a group of PTT handsets how and where they operate on the planet. New accounts normally start out with PTT radios and a Talkgroup. The subscriber will then use the PTT portal to add their two PTT phones into that Talkgroup. While the PTT service is 100% global, the actual service areas are one or more bordered regions drawn on a Google map inside the portal. All these functions are created by the subscriber.
A Talkgroup is a paid monthly service and multiple Talkgroups can be purchased. Talkgroups are sold by square kilometer size, and can be divided into service regions anywhere on the planet. A Talkgroup can have unlimited phones assigned to it at no additional cost. Phones within the Talkgroup enjoy unlimited talk-time.
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Intelsat 19 is a geostationary communications satellite Iridium Short Burst Data (SBD) Service is an efficient network protocol designed for small low volume data packets over Iridium Circuit Switched Data Services. SBD uses a proprietary network protocol to transmit data to and from the remote terminal, with message sizes of under 2KB.
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RUDICS is a circuit switched data service designed and incorporated into an integrated data solution with applications such as remote asset monitoring, control, and data file transfer designed to support hundreds or thousands of remote devices.
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