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
From your phone, display the main menu, select the CONNECT icon and press OPTIONS.
Select OPEN, turn ON BLUETOOTH, select the PAIRED DEVICES tab and press OPTIONS.
Select NEW PAIRED DEVICE, select MORE DEVICES (searching).