Always been this way. They are a transmitter and should be off.
Just more and more people getting BT headsets
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I wish they would simply state this "Do not use XYZ during takeoff and landings to be able to hear for instructions in an emergency" otherwise its simply gets a response of "meh" by the majority of the DYKWIA crew.SQ asked us to remove our NC headsets (non Bluetooth), saying we wouldn't be able to hear instructions in an emergency.