A friend gave me an old QFive bluetooth headset 2.0. He showed me how to pair it using another friends phone. But it didn't ask for a passkey. Now when I try to pair it with my Blackberry its asking for a passkey. I am un able to reach the friend who gave it to me, so now I am at a loss. Is there some way of resetting it?

Try to put your headset in pairing mode, prior to trying to pair it with your phone. To do it, begin with it turned off. Then, if it is the first time it is being paired, just by turning it on (i.e. by pressing and holding the call button for some 2 seconds), it should enter the pairing mode. Otherwise, keep holding the call button past the turning on phase (a total of some 8 to 10 seconds), until its indicator light is flashing in red and blue, thus indicating it is in pairing mode. Either way within the next 2 minutes, make your phone's bluetooth application search for new devices. After a little while, your headset should appear on-screen. Select it and make it connect. If a pairing code (or passkey, or PIN) is requested, enter '0000' (four zeros). If the pairing process is successful, your headset should enter the stand-by mode. By the way, if its data sheet happens to be missing, feel free to download it from this location.
Really hope you are able to sort your problems out soon.
Anyway, please, let me know if I can help you any further .
Regards, Carlos

Step One:
Prepare Phone-
Turn on Bluetooth
For most phones, go to Settings/
Tools menu and select Bluetooth
or Connectivity and select "On."
(Or see the user guide for your
phone.)
SETTINGS
Time and Date
Phone Settings
Bluetooth
Sound Settings
Network Services
Security
Reset Settings
BLUETOOTH
Discover/
Search
BLUETOOTH
220Plantronics
Headset Passkey
PASSKEY
0000
Step Two:
Prepare Headset-
Pairing Mode
Begin with headset turned off. Turn
headset on (hold call control button
for 2 seconds until the light flashes
blue) and it will automatically go
into pairing mode, flashing red
and blue.
Step Three:
Pairing-
Add Headset to Phone
For most phones, go to Settings/Tools
> Bluetooth > Search or Add a Device,
then Select "220Plantronics."
For passkey enter 0000. Headset
will flash blue when paired
successfully. It is now powered on
and ready to use.
NOTE: Normally you only need to pair the headset and handset once. If headset has been previously paired with
another device, follow pairing instructions on the next page.

See
http://www.plantronics.com/media/media_resources/literature/user_guides/explorer220_ug_en_es_fr_pt.pdf

every blue tooth ear piece I ever had the passkey was 0000 (4 zeros)

Hello Friend,
Here is the link to download the Samsung WEP410 bluetooth user manual:
http://dar.selfip.com/documents/
and the passkey by default is 0000.
Best Regards,

You may be having compatibility issue instead of what you suspect may be wrong with both your phone and the Bluetooth headset your friend gave you.

Well, there is no such thing as a Bluetooth headset being permanently locked in to a phone.

As long as there is an open 'visible' Bluetooth connection option and there are devices in range ready to pair, the process to pair starts.

Whenever there are incompatibility issues, pairing two devices using Bluetooth becomes a hassle.

that motorola is in the series of bluetooths that all have 0000 for pin numbers and they are NOT changeable.
turn bluetooth off push the button with the phone on it until lited LED turns Purple immediately release and open mic, now it is ready to pair.
then go to the phone tool>bluetooth> search for device enter pin 0000
it will then verify and Voila you are set

-----How to Create a new Connection----

Pairing with Phone
1. Turn off all devices (ST Light and Phone)
2. Turn on Phone
3. Goto Bluetooth menu on the phone (might be in connectivity)
4. Go to device list or paired devices (make sure bluetooth is turned on)
5. Delete any old profiles that are still in there.

6. Goto the Supertooth Light (BlueAnt)
7. Hold down the green button (send button)
8. while holding it down, open the microphone
9. the light should start to flash "red" and "blue" (you can release the green button)
10. go back to your phone, and go into either 'device list' menu or 'paired devices' menu on your phone.
11. click on either search, add or new devices. Function depends on different phones
12. when the phone has found the device, it should say 'ST Light BA V1'
13. select it, then enter passkey "0000"
14. If your phone ask for authorization or auto connect, just click "yes"

passkeys should be entered for both devices.
like when you are trying to paired your phone with you friend's
it would then asked to type in a passkey, you can type in any passkey you like but it should be same combination with your friend's. (so you can use 1234 punch in on yours and your friends need to use 1234 code punch in his phone, so both bluetooth device will be paired successfully).

this post is quite old but i think i'll answer it...first of all your phone must have bluetooth. to use it you must pair your phone with your bluetooth headset first. Open your bluetooth headset in pair mode and then open your phone bluetooth pair them and they will auto connect after you paired them(usually).