you can send and receive email or text messages on your android phone using the inReach to communicate with the Iridium satellite system.
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When I put my Motorola Atrix 2 in airplane mode it turns off all the radios - GPS, Bluetooth, Wifi and cellular but I can selectively turn on just the GPS (needed for lat lon in any messages you send) and the Bluetooth radio (needed to communicate with the inReach).
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When I want to send a text or email and recieve any messages waiting for me, I can turn on my cell phone wirh just the GPS and Bluetooth active and when done turn it off.
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If you don't need tracking or support for the locate function, you can leave the inReach off when not communicatibg to save batteries.