When you use the headset for the first time, it automatically pairs and connects to your phone. You can also connect your headset to another phone, and manage calls from, for example, both your personal and your work phones at the same time.
Make sure Bluetooth is activated on both phones.
To switch the headset off, press and hold the multifunction key for 5 seconds.
Press and hold the multifunction key for 5 seconds to activate pairing mode, and pair the headset with the second phone.
Switch the headset off and back on. The headset connects to both phones.