Iridium is a satellite communications constellation of 66 active low-earth-orbit satellites operated by Iridium Communications Inc. since 1998 (relaunched after bankruptcy by the original company). Provides voice, SMS, low-bandwidth data, and IoT connectivity globally including polar regions, oceans, and conflict zones where terrestrial networks are unavailable or compromised. The dominant satphone backbone for journalism, NGO field operations, military, maritime, and aviation users.
What it means in practice
Iridium’s structural value for adversarial environments: the link goes up to the satellite, not through the local cellular network. A journalist in a country during an internet shutdown, an NGO worker in a conflict zone, a maritime operator beyond cellular range can all transmit voice and basic data without depending on the local government’s telecom infrastructure. The trade-offs are real: the bill of materials is expensive (handsets $700-$1,500, airtime $1-$10 per minute or $50-$200 per month plans), bandwidth is small (data plans peak at 88 Kbps for standard, higher for Iridium Certus), latency is significant (300-700ms typical), and the satellite reception requires line-of-sight to sky, which urban environments and indoor spaces complicate. The encryption posture: voice and SMS are not end-to-end encrypted by default; sensitive content needs application-layer encryption (Signal over the data plan, encrypted file transfers via VPN over the data link).
Who uses it, and against whom
Customer base: war correspondents, BBC and Reuters bureau staff in places where local networks are blocked or surveilled, NGO security and field staff (Médecins Sans Frontières, ICRC, UNICEF in deployment), humanitarian deminers, polar expeditions, maritime crews, military forward-deployed units (Iridium has DoD contracts for tactical satellite communications), aircraft cockpit data links. The threat surface: Iridium itself is subject to lawful-intercept obligations in jurisdictions where it operates (the link emerging from the satellite ground station is reachable on legal process), and the radio-frequency emissions of an active Iridium handset can be direction-found by adversaries with the right equipment (a documented concern in Yemen and Syria conflict zones). The defense is application-layer encryption plus operational discipline (turn off when not actively in use to minimize emission window).
What you can change today
If your operation requires Iridium, plan the workflow before deployment. Choose a recent handset (Iridium 9555, 9575 Extreme, Iridium GO! exec for tethered Wi-Fi data), get the appropriate plan for the deployment length and data needs, test the handset in a varied-environment session before the actual operation. For sensitive content: route everything through Signal over the data link rather than using the native voice or SMS, accept the latency cost, do not rely on any unencrypted Iridium-native channel for content that matters. For high-target operators: assume the link is monitored at the ground-station egress, plan content and timing accordingly, and keep emission windows short.