What do i have to write in the place of bluetooth pass code?

İ read the manual of my new mobile and it sais i have to write it once only. Do i have to write my pin code or what?

What do i have to write in the place of bluetooth pass code?
When pairing a bluetooth device to a phone, you have to enter the pass code for secure connections. They are usually defaulted to 0000 for Motorola. Once you enter this passcode, you will not have to re-enter the passcode unless you re-pair the device to the phone.