Nokia HF-23 - Switch a Call between Car Kit and Connected Device; Send DTMF Tones

Calls
20
■ Switch a call between car kit and connected
device
To switch a call from the car kit to your compatible phone, press and
hold for about 2 seconds. Some phones may close the Bluetooth
connection until the call ends.
To switch the call back to the car kit, press the wheel when Reconnect is
displayed, or use the relevant function on your device.
■ Send DTMF tones
You can send DTMF tone strings (for example, a password) during a call.
Press the wheel when Call options is displayed, and select Send DTMF.
Scroll to the first digit of the string, and press the wheel. Select the
other digits of the string in the same way. (To delete the most recent
digit, press .) Once the whole string is displayed, press to send it as
DTMF tones.