I have a hfblu10k headset but lost the code to pair it with my cell iphone

Pairing with iPhone

1. Connect the iPhone Dual Dock or iPhone Bluetooth Travel Cable to a USB 2.0 port on your computer (not on the keyboard).
2. Connect iPhone and the headset to the dock or cable. The headset pairs with iPhone automatically.

Pairing iPhone Bluetooth Headset with another Bluetooth-enabled deviceTo pair the iPhone Bluetooth Headset with another wireless device, such as a Bluetooth-enabled phone or computer.
Step 1: Set the headset to be discoverable

1. Turn off the headset.
2. Press and hold the headset button for about eight seconds, until you hear the startup tone and then five quick high beeps.
   
   The headset is now discoverable and will remain so for about five minutes. The status light blinks while the headset is discoverable.

Step 2: Turn on Bluetooth on the other device and search for devices

1. On the device, turn Bluetooth on and set the device to search for other Bluetooth devices.
2. On the device, choose iPhone Bluetooth Headset and enter the PIN code 0000.

See the instructions that came with your other Bluetooth-enabled device for more information about pairing it with Bluetooth devices.

Hello Chris,
Did you try going into "discoverable" mode in the headset?
Please follow these steps and this should help you pair it with the iPhone.
1. Go to Settings > General > Bluetooth 4. Ensure Bluetooth is turned On 5. Ensure the headset is turned Off 6. Press and hold the Answer button until you have a solid blue LED 7. Touch the headset in the list (on iPhone) 8. The passkey is 0000 (4 zeros) 9. Enter the PIN 10. Tap Done
If that's not the problem, then let me know. I'll be glad to help you out.

Please rate this solution if it helps you.

I just paired one that sounds like yours with my phone and don't remember needing a pass code, but try 0000

From the quick start guide at:
http://www.kyocera-wireless.com/support/pdf/bluetooth-kyo105-quick-start-guide.pdf

PAIRING THE HEADSET WITH YOUR CELL PHONE
Note: Ensure your headset is powered off, and your cell phone is powered on.
a. Press and hold the Multi Function Button for 6 seconds until the LED Indicator flashes red and blue. A tone will sound indicating your headset is in pairing mode.
b. Activate the Bluetooth connection from your cell phone. Execute the search function to search for Bluetooth devices. When the search completes, a list of supported devices will be displayed on your cell phone screen.
Note: The headset will not be detected unless first placed in
pairing mode.
c. To start the pairing process, select KYO105 from the device list.
d. When prompted select 0000 as the passkey.

Some headsets have a built in code not all are 0000 check your documentaion for both the phone and headset

Make sure the bluetooth headset and the iPhone are both in pairing mode. Set the headset in pairing mode first and once set then go and turn on the iPhone bluetooth. It may take about 30 seconds to a minute for it to find the headset. Once the iPhone has found the headset make sure you select it on the phone and it will pair from there - Hope this Helps!!

Make sure that the headset and the phone are both are in "pairing" mode. Even though the iPhone's bluetooth is on you will have to select the headset from the phones bluetooth menu. To get the headset into pairing mode press and hold the "+" sign for 3 seconds. Hope this Helps!

Its either 0000,1234

it is 0000

you need to have the manual for hour jawbone headset and follow those instructions.  You have to put the headset in "pairing mode" and then once you do that (follow headset instructions) it's simple to just go to settings, bluetooth and tell iphone to search for the headset.  
Instead of headset issues, we're having car speaker phone issues.  I have the iphone paired with a motorola bluetooth car speaker, and it works when you are making calls.  However when a call comes in, the speaker doesn't pick up, the phone just rings as normal.  That's a problem as you need to be hands free in our state, and if a cop happens to see you, you're in for it

Here is a link to a list for your bluetooth: http://www.kenwood.com/bt/bt100/en.html