This sounds like your phone is now "paired" to another device through Bluetooth - for example, a handsfree earpiece or perhaps a tablet device. It would have needed a PIN to be verified on both devices at some stage for it to work.
You can easily remove the pairing if this is not something you've intentionally done or want to use, the method will depend what phone you have.
Whatever it is the device can't be v. far away. Have a look around.
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