"When you're not actively connected to anything, your phone is still talking, constantly, to anyone nearby set up to listen. Your Bluetooth signal isn't really turned off. Instead, it's advertising your smartphone, broadcasting identifiers, and in some cases, actually connecting to tracking systems you've definitely never agreed to be tracked by."
"When you disconnect your smartphone and your headphones, Bluetooth doesn't just 'stop.' It keeps broadcasting small packets of data containing the device Bluetooth name, a MAC address for unique device identification, Bluetooth profiles supported by your device, and, in some cases, phone specs and more."
"Most of this passive broadcasting is handled by Bluetooth Low Energy - BLE for short. BLE is just the low-power variant of standard Bluetooth, and for most purposes, the distinction doesn't matter much. Both broadcast, both can be tracked."
Bluetooth technology continues to transmit data even when devices are not actively connected. It broadcasts identifiers and device information, which can be tracked without user consent. This passive broadcasting is primarily managed by Bluetooth Low Energy (BLE), which operates in the background. Users often believe that turning off Bluetooth stops all activity, but the technology remains active, facilitating quick connections while also posing privacy concerns due to unconsented tracking.
Read at MakeUseOf
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