Welcome to the forums colinb43. The instructions for pairing the Plantronics Voyager 510 and 520 models are the same;
1.) Put your phone into pairing mode
This can usually be accomplished by going under settings in your menu and selecting Bluetooth. Follow the prompts to "find a new device." If you are having problems, refer to your phone's user guide.
2.) Put your Voyager headset into pairing mode
Start with your headset on. Press and hold both the call answer button and the volume up button (marked with +) until the indicator flashes red and blue.
3.) Select the headset in your phone's Bluetooth device menu and enter in universal key
Your phone may or may not ask you to enter in a key code. If it does, the code is always four zeros: 0000
4.) You are paired up!
They are not much different for the VoyagerPRO;
1 Turn on your phone’s Bluetooth feature.For most phones, select Settings/Tools > Connections > Bluetooth > On. See your phone’s user guide for more information.
2 Turn the headset on.Press and hold the power button until the indicator LED flashes red/blue. The headset is now in pairing mode.If you don’t see the red/blue flash, press and hold the power button to turn your headset
off, and then press and hold the power button again until you see the red/blue flash.
3 Use the commands on your phone to locate your headset.For most phones, select Settings/Tools > Devices > Bluetooth > PROPlantronics. See your phone’s user guide for more
4 If prompted for the Passkey (PIN code),
enter 0000.Pairing is successful when the indicator on your headset flashes blue. Your headset is now connected and ready to use.
"You silly twisted boy, you" - Hercules Grytpype-Thynne