PIN number handling in j2me application

have to make a PIN protected j2me application, how can a default PIN number be applied to the application so that the user may have to change the PIN on开发者_运维百科 the first run.

PS: PIN number is not the actual PIN number of the phone,it is application specific PIN

Do you need for the default PIN to be different for different clients? If not, then have a default PIN and let the client know the PIN and provide an option to change the PIN after login.