Pairing Bluetooth devices is different depending on the phone model and the Bluetooth device in question and so the best way to answer the question is to provide you with a link which details numerous different items and phones; www.plantronics.com/us/common/easytopair Clicking on this link will take you to a website which will allow you to choose your handset, network and Bluetooth device and will then give you handset specific instructions about how to pair your device.
There are generally three steps to pairing Bluetooth devices to a phone, these steps don't tend to change although the processes involved often do. The first step is to prepare the device, the second step is to prepare the phone and the final step is to pair the phone and device up. Some phones will connect to the device as soon as the device is switched on and then all you will need to do is follow the onscreen instructions. Some may ask for a pass key number, if they do this and you have not previously set one it will generally be set as 0000 unless stated otherwise in the pack which accompanies the device. Pairing Bluetooth devices with game stations is very similar and often the console will pick up the device when it is switched on, allowing you to follow onscreen instructions.
There are generally three steps to pairing Bluetooth devices to a phone, these steps don't tend to change although the processes involved often do. The first step is to prepare the device, the second step is to prepare the phone and the final step is to pair the phone and device up. Some phones will connect to the device as soon as the device is switched on and then all you will need to do is follow the onscreen instructions. Some may ask for a pass key number, if they do this and you have not previously set one it will generally be set as 0000 unless stated otherwise in the pack which accompanies the device. Pairing Bluetooth devices with game stations is very similar and often the console will pick up the device when it is switched on, allowing you to follow onscreen instructions.