You need to pair devices when powering up Rhythm n'Blue for the first time. Subsequently, all connections between your phone and Rhythm n'Blue 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, press OPTIONS.
Select OPEN, check that BLUETOOTH is ON, select the PAIRED DEVICES tab, press OPTIONS.
Select NEW PAIRED DEVICE, select MORE DEVICES (searching).
Press STOP, Select Rhythm n'Blue (waiting).
Enter 1234 as PASSCODE, press OK.
After the 'beep', accept connection request pressing YES.
Known issues with this phone: No particular problem noted to this date.