the min is a unique nuraber used by the switch to contact the phone. sometimes it is the same as the directory nuraber (phone nuraber), sometimes it is different.
it has nothing to do with what phone you are using phone.
it kind of sounRAB like you are trying to change phones on the account. if that is the case, did you give cricket your new esn? has your phone been programmed with the correct settings (prl, sysid, etc...)