How does my phone know that my headphones are turned on when the bluetooth setting is off?

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How does my phone know that my headphones are turned on when the bluetooth setting is off?

In: Technology

The Bluetooth device and phone maintain a connection to communicate with each other, and that connection is not severed until the device has been turned off or you manually turn off the Bluetooth. Once the device is turned off it isn’t working to maintain the connection so the phone sees it as gone.

This was changed in many phones a few years ago. The off switch doesn’t turn off the Bluetooth module any more but just disables all data transfer. That way the devices can still see each other but you have the illusion that ‘Bluetooth is off’