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Cox deletes ‘Active Listening’ ad pitch after boasting that it eavesdrops though our phones
(www.fastcompany.com)
This is a most excellent place for technology news and articles.
You could be right, but I'm not alleging they would use cell.
Presumably the smart appliance already has wireless capabilities like WiFi/BLE. And then it's just a software exercise on how to code an interface between devices of the same manufacturer.