You need to pair devices when powering up CK3x00 for the first time.
Subsequently, all connections between your phone and CK3x00 are
automatically established when both devices are within a few meters
range of each other.
Procedure
Select Start / Settings / Connections...
Click on the Bluetooth icon in the task bar...
In Mode, check that
Bluetooth is turn on and that
your device is discoverable...
In Devices, press on New
Partnership...searching...