1. A method for provisioning a subscriber in a provisioning system for a mobile communications device, wherein a registration is associated with the subscriber and the registration comprises a plurality of fields and one of the fields includes an identification field, the method comprising the steps of: determining if identification information in the identification field is faulty; if said identification information is faulty, selecting another field from the plurality of fields; assigning said selected field with other identification information associated with the subscriber; searching a list of existing subscriber registrations for subscriber identification information matching said other identification information; if said other identification information matches the subscriber identification information for an existing subscriber registration, associating the faulty identification information for the subscriber with the existing subscriber registration; and if said other identification information does not match the subscriber identification information for the existing subscriber registration, creating a modified registration associated with the subscriber aid said modified registration including one or more restrictions.