You can use voice dialling, if your mobile device supports this feature with the headset. Refer the user guide of your mobile device (for example Use your voice to call a contact). To activate voice dialling, when no call is in progress, press and hold the multifunction key for 2 seconds, if necessary, follow the instructions in the user guide. If you have connected your headset to two devices, the call is made on the device that you last had an active call on with the headset.