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OP is using Iridium SBD according to the article, specifically this modem: https://www.groundcontrol.com/product/rockblock-9603-compact-plug-and-play-satellite-

• keepamovin 2y ago
  Oh ok, I mean I got they were using some special build for the project. But based on them saying "I often go all around the world" (to the effect of that), seemed they'd probably be using handsets, outside of the article.