Does Bluetooth work when the phone is off?

No, Bluetooth does not work when your phone is turned off. Bluetooth requires the phone to be powered on to establish a connection, communicate with other Bluetooth devices, and maintain a connection.

When your phone is off, it is essentially disconnected from all networks, including Bluetooth. The Bluetooth functionality depends on the phone's internal components, which only work when the phone is powered on.

However, if your phone is in sleep mode or standby mode, but still powered on, Bluetooth can still work and maintain connections (such as with headphones, speakers, or smartwatches).