Reconnect the headset
To connect the headset to your mobile device, make the connection in the
Bluetooth menu of your device; or switch on the headset, and press and
hold the multifunction key for about 2 to 3 seconds until you hear a short
beep.
You can set your device to connect with the headset automatically when
the headset is switched on. To do this in Nokia devices, change your paired
device settings in the Bluetooth menu.