Nokia HS-55W - Manual (Page 10)

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You do not need to delete the pairing with the headset to disconnect it.
Reconnect the headset
To connect the paired headset to your phone, switch on the headset, or make the
connection in the Bluetooth menu of your phone.
You can set your phone to connect with the headset automatically when the
headset is switched on. To do this in Nokia phones, change your paired device
settings in the Bluetooth menu.