Bluetooth help?????

my friend has a ringtone and i want to get i know you can get through bluetooth and you need a passkey. what would your password usally passkey be like?
such as accont password
vociemail
ect.
what i mean by this is what is it like account info or settings ect.
i don't mean like what should i set it for. Or if you know how to set or change the paskey for my blutooth. thank you
oh and by the way friends have already told me to try 4 zeros and the last 4 digets of my phone number so that is not a good answer!