On your blackberry device please follow these instructions.
1. Options/Bluetooth > Press the Menu Key- which is the Blackberry icon key left of the trackball.
2. Select Disable Bluetooth
Then go to Options/ Select the Menu Key>Set Discoverable field to NO, go to the top to Device Name and rename it to something else...I have my name as Secured...DO NOT RELATE THE REMAINING TO ANYTHING THAT WILL POINT BACK AT YOU OR YOUR DEVICE For ex: Your name or nickame.....
Then pair your bluetooth earpiece back on your device...Again this will NOT block the process of your bluetooth earpiece. It only block out your device from being search by a snooper as such..