My blackberry is asking for a numeric passkey to
The passkey for the H500, as well as for the vast majority of bluetooth headsets, is hardcoded to '0000' (four zeros).
You just have to pair your bluetooth headset once. All subsequent connections between the headset and phone should be done automatically, provided that both the headset and the phone's bluetooth stack are turned on.
Please, let me know if you need further informations.