I forget my security password.how unlock my phone. nokia 6500 slide

My dear:
type *#06# on your phone to get it.

12345 is a standard code and 00000, but if you change it and you have forgotten your unlock code, you'll just have to reformat it

key combination which is used to hard reset the phone (similar to #*7370). It is useful in some cases, for example when the phone cannot reboot. The trick is by switching off the phone then press and hold Call key (Green key) + * key + 3 key + power button for a couple of seconds

but all your data will be lost

Thanks